[SOLVED] Can't access a node via another nodes Web GUI (Error 595)

That fixed my issue... I don't know how I didn't see that, thank you so much!

Edit: Never mind, it didn't, I have the same problem again
So after I restart the nodes it works for 5 minutes but then it doesn't again
 
Last edited:
Could the problem be my IPv6 address? Because when I tried to connect to node B's console via node A's WebGUI it told me that it couldn't connect to port 22 and showed the IPv6 address of the server...

Edit: Image
1690811117108.png
 
Last edited:
fabian said:
okay, then let's try again!
Click to expand...
Node AX41-1665271

cat /etc/hosts
Code: 
### Hetzner Online GmbH installimage
127.0.0.1 localhost
xxx.xx.xx.169 pve-pycmc.pycmc.eu pve-pycmc
xxx.xxx.xxx.146 AX41-1665271
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
xxxx:xxx:261:4fe2::2 AX41-1665271

getent hosts pve-pycmc
Code: 
xxx.xx.xx.169   pve-pycmc.pycmc.eu pve-pycmc

curl -kv https://pve-pycmc:8006
Code: 
*   Trying xxx.xx.xx.169:8006...
* Connected to pve-pycmc (xxx.xx.xx.169) port 8006 (#0)
* ALPN: offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN: server did not agree on a protocol. Uses default.
* Server certificate:
*  subject: OU=PVE Cluster Node; O=Proxmox Virtual Environment; CN=AX41-1665271
*  start date: Jan 17 10:16:07 2023 GMT
*  expire date: Jan 16 10:16:07 2025 GMT
*  issuer: CN=Proxmox Virtual Environment; OU=8c34a05a-1196-498a-9e10-bba503a64de2; O=PVE Cluster Manager CA
*  SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
* using HTTP/1.x
> GET / HTTP/1.1
> Host: pve-pycmc:8006
> User-Agent: curl/7.88.1
> Accept: */*
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
< HTTP/1.1 200 OK
< Cache-Control: max-age=0
< Connection: Keep-Alive
< Date: Mon, 31 Jul 2023 13:42:35 GMT
< Pragma: no-cache
< Server: pve-api-daemon/3.0
< Content-Length: 2403
< Content-Type: text/html; charset=utf-8
< Expires: Mon, 31 Jul 2023 13:42:35 GMT
<
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>pve-pycmc - Proxmox Virtual Environment</title>
    <link rel="icon" sizes="128x128" href="/pve2/images/logo-128.png" />
    <link rel="apple-touch-icon" sizes="128x128" href="/pve2/images/logo-128.png" />
    <link rel="stylesheet" type="text/css" href="/pve2/ext6/theme-crisp/resources/theme-crisp-all.css?ver=7.0.0" />
    <link rel="stylesheet" type="text/css" href="/pve2/ext6/crisp/resources/charts-all.css?ver=7.0.0" />
    <link rel="stylesheet" type="text/css" href="/pve2/fa/css/font-awesome.css" />
    <link rel="stylesheet" type="text/css" href="/pve2/css/ext6-pve.css?ver=8.0.3" />
    <link rel="stylesheet" type="text/css" href="/pwt/css/ext6-pmx.css?ver=v4.0.6-t1687803897" />
    <link rel="stylesheet" type="text/css" media="(prefers-color-scheme: dark)" href="/pwt/themes/theme-proxmox-dark.css?ver=v4.0.6-t1687803897" />
 
    <script type='text/javascript'>function gettext(buf) { return buf; }</script>
 
    <script type="text/javascript" src="/pve2/ext6/ext-all.js?ver=7.0.0"></script>
    <script type="text/javascript" src="/pve2/ext6/charts.js?ver=7.0.0"></script>
 
    <script type="text/javascript" src="/pve2/js/u2f-api.js"></script>
    <script type="text/javascript" src="/qrcode.min.js"></script>
    <script type="text/javascript">
    Proxmox = {
        Setup: { auth_cookie_name: 'PVEAuthCookie' },
        defaultLang: 'en',
        NodeName: 'pve-pycmc',
        UserName: '',
        CSRFPreventionToken: 'null'
    };
    </script>
    <script type="text/javascript" src="/proxmoxlib.js?ver=v4.0.6-t1687803897"></script>
    <script type="text/javascript" src="/pve2/js/pvemanagerlib.js?ver=8.0.3"></script>
    <script type="text/javascript" src="/pve2/ext6/locale/locale-en.js?ver=7.0.0"></script>

    <script type="text/javascript">
    if (typeof(PVE) === 'undefined') PVE = {};
    Ext.History.fieldid = 'x-history-field';
    Ext.onReady(function() { Ext.create('PVE.StdWorkspace');});
    </script>

  </head>
  <body>
    <!-- Fields required for history management -->
    <form id="history-form" class="x-hidden">
    <input type="hidden" id="x-history-field"/>
    </form>
  </body>
</html>
* Connection #0 to host pve-pycmc left intact

pvenode cert info
Code: 
┌─────────────────┬──────────────────────────────────────────────────────────────────────────────────────────────────┐
│ filename        │ pve-root-ca.pem                                                                                  │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ fingerprint     │ XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:2D:DE:52:CF:8F:7D  │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ subject         │ /CN=Proxmox Virtual Environment/OU=8c34a05a-1196-498a-9e10-bba503a64de2/O=PVE Cluster Manager CA │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ issuer          │ /CN=Proxmox Virtual Environment/OU=8c34a05a-1196-498a-9e10-bba503a64de2/O=PVE Cluster Manager CA │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ notbefore       │ 2022-07-19 20:40:16                                                                              │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ notafter        │ 2032-07-16 20:40:16                                                                              │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ public-key-type │ rsaEncryption                                                                                    │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ public-key-bits │ 4096                                                                                             │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ san             │ []                                                                                               │
└─────────────────┴──────────────────────────────────────────────────────────────────────────────────────────────────┘
┌─────────────────┬──────────────────────────────────────────────────────────────────────────────────────────────────┐
│ filename        │ pve-ssl.pem                                                                                      │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ fingerprint     │ XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:D3:39:5F:8E:97:FB  │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ subject         │ /OU=PVE Cluster Node/O=Proxmox Virtual Environment/CN=AX41-1665271                               │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ issuer          │ /CN=Proxmox Virtual Environment/OU=8c34a05a-1196-498a-9e10-bba503a64de2/O=PVE Cluster Manager CA │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ notbefore       │ 2023-01-17 10:16:07                                                                              │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ notafter        │ 2025-01-16 10:16:07                                                                              │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ public-key-type │ rsaEncryption                                                                                    │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ public-key-bits │ 2048                                                                                             │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ san             │ - 127.0.0.1                                                                                      │
│                 │ - 0000:0000:0000:0000:0000:0000:0000:0001                                                        │
│                 │ - localhost                                                                                      │
│                 │ - xxxx:xxx:0261:4fe2:0000:0000:0000:0002                                                        │
│                 │ - AX41-1665271                                                                                   │
└─────────────────┴──────────────────────────────────────────────────────────────────────────────────────────────────┘
 
Last edited:
Node pve-pycmc
cat /etc/hosts
Code: 
### Hetzner Online GmbH installimage
127.0.0.1 localhost.localdomain localhost
xxx.xx.xx.169 pve-pycmc.pycmc.eu pve-pycmc
xxx.xxx.xxx.146 AX41-1665271
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
xxxx:xxx:121:14bd::2 pve-pycmc.pycmc.eu pve-pycmc

getent hosts AX41-1665271
Code: 
xxx.xxx.xxx.146 AX41-1665271
curl -kv https://ax41-1665271:8006
Code: 
*   Trying xxx.xxx.xxx.146:8006...
* Connected to ax41-1665271 (xxx.xxx.xxx.146) port 8006 (#0)
* ALPN: offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN: server did not agree on a protocol. Uses default.
* Server certificate:
*  subject: OU=PVE Cluster Node; O=Proxmox Virtual Environment; CN=AX41-1665271
*  start date: Jan 17 10:16:07 2023 GMT
*  expire date: Jan 16 10:16:07 2025 GMT
*  issuer: CN=Proxmox Virtual Environment; OU=8c34a05a-1196-498a-9e10-bba503a64de2; O=PVE Cluster Manager CA
*  SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
* using HTTP/1.x
> GET / HTTP/1.1
> Host: ax41-1665271:8006
> User-Agent: curl/7.88.1
> Accept: */*
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
< HTTP/1.1 200 OK
< Cache-Control: max-age=0
< Connection: Keep-Alive
< Date: Mon, 31 Jul 2023 13:47:07 GMT
< Pragma: no-cache
< Server: pve-api-daemon/3.0
< Content-Length: 2409
< Content-Type: text/html; charset=utf-8
< Expires: Mon, 31 Jul 2023 13:47:07 GMT
<
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>AX41-1665271 - Proxmox Virtual Environment</title>
    <link rel="icon" sizes="128x128" href="/pve2/images/logo-128.png" />
    <link rel="apple-touch-icon" sizes="128x128" href="/pve2/images/logo-128.png" />
    <link rel="stylesheet" type="text/css" href="/pve2/ext6/theme-crisp/resources/theme-crisp-all.css?ver=7.0.0" />
    <link rel="stylesheet" type="text/css" href="/pve2/ext6/crisp/resources/charts-all.css?ver=7.0.0" />
    <link rel="stylesheet" type="text/css" href="/pve2/fa/css/font-awesome.css" />
    <link rel="stylesheet" type="text/css" href="/pve2/css/ext6-pve.css?ver=8.0.3" />
    <link rel="stylesheet" type="text/css" href="/pwt/css/ext6-pmx.css?ver=v4.0.6-t1687803897" />
    <link rel="stylesheet" type="text/css" media="(prefers-color-scheme: dark)" href="/pwt/themes/theme-proxmox-dark.css?ver=v4.0.6-t1687803897" />
   
    <script type='text/javascript'>function gettext(buf) { return buf; }</script>
   
    <script type="text/javascript" src="/pve2/ext6/ext-all.js?ver=7.0.0"></script>
    <script type="text/javascript" src="/pve2/ext6/charts.js?ver=7.0.0"></script>
   
    <script type="text/javascript" src="/pve2/js/u2f-api.js"></script>
    <script type="text/javascript" src="/qrcode.min.js"></script>
    <script type="text/javascript">
    Proxmox = {
        Setup: { auth_cookie_name: 'PVEAuthCookie' },
        defaultLang: 'en',
        NodeName: 'AX41-1665271',
        UserName: '',
        CSRFPreventionToken: 'null'
    };
    </script>
    <script type="text/javascript" src="/proxmoxlib.js?ver=v4.0.6-t1687803897"></script>
    <script type="text/javascript" src="/pve2/js/pvemanagerlib.js?ver=8.0.3"></script>
    <script type="text/javascript" src="/pve2/ext6/locale/locale-en.js?ver=7.0.0"></script>

    <script type="text/javascript">
    if (typeof(PVE) === 'undefined') PVE = {};
    Ext.History.fieldid = 'x-history-field';
    Ext.onReady(function() { Ext.create('PVE.StdWorkspace');});
    </script>

  </head>
  <body>
    <!-- Fields required for history management -->
    <form id="history-form" class="x-hidden">
    <input type="hidden" id="x-history-field"/>
    </form>
  </body>
</html>
* Connection #0 to host ax41-1665271 left intact

pvenode cert info
Code: 
┌─────────────────┬──────────────────────────────────────────────────────────────────────────────────────────────────┐
│ filename        │ pve-root-ca.pem                                                                                  │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ fingerprint     │ XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:2D:DE:52:CF:8F:7D  │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ subject         │ /CN=Proxmox Virtual Environment/OU=8c34a05a-1196-498a-9e10-bba503a64de2/O=PVE Cluster Manager CA │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ issuer          │ /CN=Proxmox Virtual Environment/OU=8c34a05a-1196-498a-9e10-bba503a64de2/O=PVE Cluster Manager CA │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ notbefore       │ 2022-07-19 22:40:16                                                                              │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ notafter        │ 2032-07-16 22:40:16                                                                              │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ public-key-type │ rsaEncryption                                                                                    │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ public-key-bits │ 4096                                                                                             │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ san             │ []                                                                                               │
└─────────────────┴──────────────────────────────────────────────────────────────────────────────────────────────────┘
┌─────────────────┬──────────────────────────────────────────────────────────────────────────────────────────────────┐
│ filename        │ pve-ssl.pem                                                                                      │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ fingerprint     │ XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:D3:39:5F:8E:97:FB  │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ subject         │ /OU=PVE Cluster Node/O=Proxmox Virtual Environment/CN=AX41-1665271                               │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ issuer          │ /CN=Proxmox Virtual Environment/OU=8c34a05a-1196-498a-9e10-bba503a64de2/O=PVE Cluster Manager CA │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ notbefore       │ 2023-01-17 11:16:07                                                                              │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ notafter        │ 2025-01-16 11:16:07                                                                              │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ public-key-type │ rsaEncryption                                                                                    │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ public-key-bits │ 2048                                                                                             │
├─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ san             │ - 127.0.0.1                                                                                      │
│                 │ - 0000:0000:0000:0000:0000:0000:0000:0001                                                        │
│                 │ - localhost                                                                                      │
│                 │ - xxxx:xxx:0261:4fe2:0000:0000:0000:0002                                                        │
│                 │ - AX41-1665271                                                                                   │
└─────────────────┴──────────────────────────────────────────────────────────────────────────────────────────────────┘
 
Last edited:
Nic_ said:
Could the problem be my IPv6 address? Because when I tried to connect to node B's console via node A's WebGUI it told me that it couldn't connect to port 22 and showed the IPv6 address of the server...

Edit: Image
View attachment 53706
Click to expand...
that depends whether ipv6 works? the services bind to both.. you can try ssh and curl to the ipv6 address to find out ;)
 
When I curl node A on node B via IPv6 (curl -6 'https://[xxxx:xxx:261:4fe2::2]:8006') nothing will happen
I also tried telnet -6 xxxx:xxx:261:4fe2::2%enp8s0 8006
Code: 
Server lookup failure:  xxxx:xxx:261:4fe2::2%enp8s0:8006, Name or service not known

Same thing with node B to A
 
Last edited:
well, if IPv6 is not working, then you probably also shouldn't have an hosts entry for an IPv6 address for your nodes ;)
 
How can I remove the IPv6 addresses from the certificates and the links?
Do I just have to remove it from /etc/hosts and restart everyting?
 
it won't be removed from the certificates, but it should no longer resolve then (except if DNS also contains that resolution?)
 
Removing the IPv6 addresses did resolve the issue for real this time.
Thanks Fabian for your great help!
 
Nic_ said:
Could the problem be my IPv6 address? Because when I tried to connect to node B's console via node A's WebGUI it told me that it couldn't connect to port 22 and showed the IPv6 address of the server...

Edit: Image
View attachment 53706
Click to expand...

I am having this exact issue even when i try from the SSH console itself (this is a fresh PVE 8 install - my first ever proxmox) install.
I can ping each node from each node over IPv6
I can curl the web interface over IPv6
I can't use ssh over IPv6 it says connection timed out.
the ss command indicated SSH is listening on [::]:ssh
firewall is turned off at a cluster level
iptables shows no rules configured at all

i am heck confused why ssh IPv6 connectivity is failing...
 
how are you trying to SSH?
 
fabian said:
how are you trying to SSH?
Click to expand...
Hi Fabian, i think we confirmed 100% this is a bug in IPv6 over thunderbolt-net interfaces. @ualex confirmed it on a vanilla Debian 12 install too - so this is appears to be an upstream issue.

I had someone on the thunderbolt-net team at intel to offer to repro this, haven't heard back (not sure if that's because they never got to this or something else).

I also asked on the Debian IPv6 mailing list but either no one answered, or my mail was blocked (i won't know until the Aug digest is viewable, it was the first time i ever used a mailing list...)

To answer your question (this is the repro uAlex and i think works, for proxmox replace Debian with proxmox in this repro:

Repro
  1. Take two machines each with debian on them with a thunderbolt TB4 connection.
  2. Ensure there are no IPTABLES filtering rules in place
  3. configure ssh to listen on all interfaces, all protocols
  4. Connect the two machines with a TB cable.
  5. Statically address each interface on each machine with an IPv6 address in the same subnet
  6. ping machine 1 IPv6 from machine 2 (this will work)
  7. try to ssh from machine 1 to machine 2 using IPv6 (this will not work) (e.g. ssh root@<ipv6address> or ssh -6 root@<ipv6 address>)
  8. note: this seems to affect other traffic other than SSH too (like ceph cluster traffic)
 
Last edited:
  • Like
Reactions: ualex
ah, okay. I am not sure we have any hardware around to test/triage that.. FWIW, I don't see your message in the public archives of the debian-ipv6 mailing list..
 
Hmm, ok, I will go see what I did on that.

Yeah you would need something like two gen 10 nucs or higher. Unless proxmox can be installed baremetal on macs (joke)
 
fabian said:
ah, okay. I am not sure we have any hardware around to test/triage that.. FWIW, I don't see your message in the public archives of the debian-ipv6 mailing list..
Click to expand...
I guess i originally sent my mail to close to when i subscribed, now it is working, someone called Marco helped me establish that the initial TCP SSH packet is being classed as an error by the sender (and I assumed dropped by the driver) before it hits the wire

the 11 error packets are all SSH TCP packets....


Code: 
root@pve1:~# ssh root@2600:a801:830:81::82
^C
root@pve1:~# ip -s -s link show en06
7: en06: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65520 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether 02:1a:44:65:db:e0 brd ff:ff:ff:ff:ff:ff
    RX:   bytes  packets errors dropped  missed   mcast           
    19053852086 20311446      0       0       0       0
    RX errors:    length    crc   frame    fifo overrun
                       0      0       0       0       0
    TX:   bytes  packets errors dropped carrier collsns           
    15565251706 18402383     11       0       0       0
    TX errors:   aborted   fifo  window heartbt transns
                       0      0       0       0       2
 
An update, the maintainer of the thunderbol-net driver has confirmed this to be a bug. As such this upstream from Debian. Will post more details if this is resolved.
 
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