ProxMox Updating through VSAT (Vessel)

I would run the following commands (will paste outputs as well for comparison) - if any of them do not work you need to take this up with your ISP:
* check that you can ping your gateway (you already did that)
* check that you can ping a public ip that responds to ping (e.g. (you already did that)
* check that you can download files via http (you might need to set a proxy, which needs to be provided by your ISP):
--2019-12-20 16:38:48--
Resolving (, 2a04:4e42:3::645
Connecting to (||:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 7907908 (7.5M) [application/x-xz]
Saving to: ‘Packages.xz’

Packages.xz                                                             100%[============================================================================================================================================================================>]   7.54M  27.5MB/s    in 0.3s    

2019-12-20 16:38:48 (27.5 MB/s) - ‘Packages.xz’ saved [7907908/7907908]

* check that you can connect to on port 443 and get the correct certificate back:
 openssl s_client -connect
depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
verify return:1
depth=0 CN =
verify return:1
Certificate chain
 0 s:CN =
   i:C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
 1 s:C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
   i:O = Digital Signature Trust Co., CN = DST Root CA X3
Server certificate
subject=CN =

issuer=C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3

No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: RSA-PSS
Server Temp Key: X25519, 253 bits
SSL handshake has read 3715 bytes and written 407 bytes
Verification: OK
New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384
Server public key is 4096 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES256-GCM-SHA384
    Session-ID: 203A75E61A6AE6E76747FBD1C125BB665E2D63DEC729617A7E82ED9F090DEF31
    Master-Key: D2FC213B44B05B499E9BBB7B5CFFA12B9A422B7EFC7E288EA4AAB9505170F0E665FD68D3809B87452FD12C681DB8F62A
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 300 (seconds)
    TLS session ticket:
    0000 - 87 f4 3b 83 59 e6 9b 70-56 5b 22 9f fc 2a 8a d8   ..;.Y..pV["..*..
    0010 - 0c d2 2f 4a 39 7e 53 cc-6f fa df cb 17 28 33 ec   ../J9~S.o....(3.
    0020 - e1 40 7c f2 c4 16 eb c3-9a ed c3 8f 28 5d 90 b6   .@|.........(]..
    0030 - 2e e8 7c 7e 25 36 b9 71-11 a8 c2 39 f1 ff f4 d7   ..|~%6.q...9....
    0040 - 68 5e 4a 1b 08 6f 0f fb-89 8a ff 50 d6 df cc ba   h^J..o.....P....
    0050 - 48 ad 4d f6 d0 7b 77 62-62 0b 73 3c f6 97 fc 0c   H.M..{wbb.s<....
    0060 - b1 f9 54 16 21 e2 51 80-77 15 60 9d f4 1e 62 0a   ..T.!.Q.w.`...b.
    0070 - 84 41 98 20 37 71 50 36-bb a4 1e 07 d6 23 04 af   .A. 7qP6.....#..
    0080 - 52 6c c5 72 52 0b 45 74-04 36 53 53 ac d4 c7 d2   Rl.rR.Et.6SS....
    0090 - 62 94 c4 d9 e3 e6 c4 86-c2 79 19 de 10 c2 fd a0   b........y......
    00a0 - 17 bf b1 0b 94 54 17 74-da 70 cf ab bd 9b 23 fc   .....T.t.p....#.

    Start Time: 1576856375
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
    Extended master secret: yes

(The certificate needs to match and verify)

* check that you can connect to likewise:
openssl s_client -connect

If any of the steps fail - take the diagnostics to your ISP

I hope this helps!
confirm package download,

Error in certificate:
root@oberon1:~#  openssl s_client -connect
depth=0 CN =, L = "                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           "
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN =, L = "

Results from maurer-it:
see txt


  • shop-maurer.txt
    16 KB · Views: 4
Seems like a fortinet firewall in your way is doing SSL MITM:
issuer=C = US, ST = California, L = Sunnyvale, O = Fortinet, OU = Certificate Authority, CN = FGVM00TM19000443, emailAddress =

-> check with the one's who are running that appliance (maybe it's your router, or your ISP has something like that) - and check with them about a potential workaround (either they should let you directly connect to https sites instead of intercepting that traffic - or you can add their CA to your local system's trust-store (I personally would not do that since I would not want to have someone intercepting my encrypted traffic - but there might not be a way around that in your environment)

I hope this helps!
Dear Stoiko good day and happy new year!
After some inspections with my cybersecurity software (fortigate) we found out that lowering the security level in certificate inspection check, the subscription can be accessed and receive the updates properly. Are you able to share with me the category of certificate to pass it inside fortigate and bring back the level as before?
Hey - happy new year 2020 to you as well!

hmm - sadly don't have too much experience with Fortinet products - probably best to ask their support what the 'security levels' of certificates mean and which effect they have.

On a quick guess I think that raising this level changes what the Fortigate does:
* higher level - it intercepts the TLS-connection (thus breaking the chain of trust) to see what happens inside the TLS encrypted connection
(I personally don't think that this has enough merit and is potentially dangerous, but that's beside the point)

* If you really want the connection to be trusted by the Proxmox host - you need to add the Fortigate's CA to the certificate trust store - but that means that they will be trusted for everything you do via https - see for how to do that.

I hope this helps!


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