unable to connect to localhost at port 10025

William Edwards

William Edwards

Renowned Member
Proxmox Subscriber
May 20, 2017
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Netherlands
cyberfusion.io
Postfix is listening on port 10025:

Code: 
root@mxfilter0-1:/usr/share/perl5# netstat -tulpn | grep 25
tcp        0      0 127.0.0.1:10025         0.0.0.0:*               LISTEN      8056/master

But seeing this in mail log:

Code: 
Oct 29 11:44:29 mxfilter0-1 pmg-smtp-filter[5196]: unable to connect to localhost at port 10025 at /usr/share/perl5/PMG/Utils.pm line 214.

Any idea?
 
Last edited:
on a hunch - does localhost indeed resolve to 127.0.0.1?
* post your '/etc/hosts'
* post the output of `ping -c 3 localhost`

also you could try restarting postfix and pmg-smtp-filter...

I hope this helps
 
Stoiko Ivanov said:
on a hunch - does localhost indeed resolve to 127.0.0.1?
* post your '/etc/hosts'
* post the output of `ping -c 3 localhost`

also you could try restarting postfix and pmg-smtp-filter...

I hope this helps
Click to expand...

Hmm. From what I see in the code, a connection to 127.0.0.1 is tried.

This issue started occurring after removing the server's public IPv4 address.

Code: 
root@mxfilter0-1:/var/log# cat /etc/hosts
127.0.0.1 localhost.localdomain localhost
2a0c:eb00:0:f9:16a:c69:c32:7b5 mxfilter0-0 mxfilter0-0.prorelay.nl
2a0c:eb00:0:f9:82e:e50:8f2:5d7 mxfilter0-1 mxfilter0-1.prorelay.nl


# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

root@mxfilter0-1:/var/log# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens18: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 82:ee:50:8f:25:d7 brd ff:ff:ff:ff:ff:ff
    inet6 2a0c:eb00:0:f9:82e:e50:8f2:5d7/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::80ee:50ff:fe8f:25d7/64 scope link
       valid_lft forever preferred_lft forever

root@mxfilter0-1:/var/log# telnet localhost 10025
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 mxfilter0-1.prorelay.nl ESMTP ProRelay
^]
telnet> quit
Connection closed.
 
Last edited:
Stoiko Ivanov said:
you're right - sorry my mistake...


anything in the logs from postfix around the error from pmg-smtp-filter?
Click to expand...

This is the full log:

Code: 
Oct 29 13:00:33 mxfilter0-1 postfix/smtpd[23802]: B80CF6244D: client=a52-108.smtp-out.eu-west-1.amazonses.com[54.240.52.108]
Oct 29 13:00:33 mxfilter0-1 pmgpolicy[23443]: SPF says pass
Oct 29 13:00:33 mxfilter0-1 postfix/cleanup[23822]: B80CF6244D: message-id=<stripped@stripped.net>
Oct 29 13:00:33 mxfilter0-1 postfix/qmgr[2590]: B80CF6244D: from=<stripped@stripped.net>, size=12361, nrcpt=2 (queue active)
Oct 29 13:00:33 mxfilter0-1 pmg-smtp-filter[14767]: 2020/10/29-13:00:33 CONNECT TCP Peer: "[127.0.0.1]:43132" Local: "[127.0.0.1]:10024"
Oct 29 13:00:33 mxfilter0-1 pmg-smtp-filter[14767]: 407015F9AAEE1CF271: new mail message-id=<stripped@stripped.net>#012
Oct 29 13:00:34 mxfilter0-1 pmg-smtp-filter[14767]: 407015F9AAEE1CF271: SA score=0/5 time=0.394 bayes=0.00 autolearn=no autolearn_force=no hits=AWL(-0.050),BAYES_00(-1.9),DKIMWL_WL_MED(-0.001),DKIM_SIGNED(0.1),DKIM_VALID(-0.1),DKIM_VALID_AU(-0.1),DKIM_VALID_EF(-0.1),HEADER_FROM_DIFFERENT_DOMAINS(0.25),HTML_MESSAGE(0.001),KAM_NUMSUBJECT(0.5),RCVD_IN_DNSWL_NONE(-0.0001),RCVD_IN_MSPIKE_H4(0.001),RCVD_IN_MSPIKE_WL(0.001),SPF_HELO_NONE(0.001),SPF_PASS(-0.001),T_KAM_HTML_FONT_INVALID(0.01)
Oct 29 13:00:34 mxfilter0-1 pmg-smtp-filter[14767]: unable to connect to localhost at port 10025 at /usr/share/perl5/PMG/Utils.pm line 214.
Oct 29 13:00:34 mxfilter0-1 pmg-smtp-filter[14767]: 407015F9AAEE1CF271: reinject mail to <info@removed.nl> (rule: default-accept) failed
Oct 29 13:00:34 mxfilter0-1 pmg-smtp-filter[14767]: 407015F9AAEE1CF271: reinject mail to <shop@removed.nl> (rule: default-accept) failed
Oct 29 13:00:34 mxfilter0-1 pmg-smtp-filter[14767]: 407015F9AAEE1CF271: processing time: 0.446 seconds (0.394, 0.037, 0)
Oct 29 13:00:34 mxfilter0-1 postfix/lmtp[23551]: B80CF6244D: to=<info@removed.nl>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.66, delays=0.2/0/0/0.45, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <info@removed.nl> (in reply to end of DATA command))
Oct 29 13:00:34 mxfilter0-1 postfix/lmtp[23551]: B80CF6244D: to=<shop@removed.nl>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.67, delays=0.2/0/0/0.46, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <shop@removed.nl> (in reply to end of DATA command))

With `-v` specified for the `smtpd` service:

Code: 
Oct 29 13:33:39 mxfilter0-1 postfix/smtpd[31111]: connect from localhost.localdomain[127.0.0.1]
Oct 29 13:33:39 mxfilter0-1 postfix/smtpd[31111]: match_list_match: localhost.localdomain: no match
Oct 29 13:33:39 mxfilter0-1 postfix/smtpd[31111]: match_list_match: 127.0.0.1: no match
Oct 29 13:33:39 mxfilter0-1 postfix/smtpd[31111]: match_hostname: smtpd_authorized_xforward_hosts: localhost.localdomain ~? 127.0.0.0/8
Oct 29 13:33:39 mxfilter0-1 postfix/smtpd[31111]: match_hostaddr: smtpd_authorized_xforward_hosts: 127.0.0.1 ~? 127.0.0.0/8
Oct 29 13:33:39 mxfilter0-1 postfix/smtpd[31111]: smtp_stream_setup: maxtime=300 enable_deadline=0
Oct 29 13:33:39 mxfilter0-1 postfix/smtpd[31111]: > localhost.localdomain[127.0.0.1]: 220 mxfilter0-1.prorelay.nl ESMTP ProRelay
Oct 29 13:33:42 mxfilter0-1 postfix/smtpd[31111]: smtp_get: EOF
Oct 29 13:33:42 mxfilter0-1 postfix/smtpd[31111]: lost connection after CONNECT from localhost.localdomain[127.0.0.1]
Oct 29 13:33:42 mxfilter0-1 postfix/smtpd[31111]: disconnect from localhost.localdomain[127.0.0.1] commands=0/0
Oct 29 13:33:42 mxfilter0-1 postfix/smtpd[31111]: name_mask: no_unknown_recipient_checks
Oct 29 13:33:42 mxfilter0-1 postfix/smtpd[31111]: name_mask: no_header_body_checks
Oct 29 13:33:42 mxfilter0-1 postfix/smtpd[31111]: master_notify: status 1
Oct 29 13:33:42 mxfilter0-1 postfix/smtpd[31111]: connection closed

So for some reason, this is failing:

Code: 
my $smtp = Net::SMTP->new('127.0.0.1', Port => 10025, Hello => $me);
 
Last edited:
Managed to reproduce the issue here locally (by removing all ipv4 addresses from my test-setup and running ipv6 only)
could you please open a bug-report over at https://bugzilla.proxmox.com (with the details and referencing this thread) - Thanks!

as a mitigation - configuring (any) ipv4 address on the interface should mitigate this:
Code: 
ip a a 172.16.0.1/32 dev eno1


William Edwards said:
This issue started occurring after removing the server's public IPv4 address.
Click to expand...

just out of curiosity - how does smtpd then get a connection from
William Edwards said:
a52-108.smtp-out.eu-west-1.amazonses.com[54.240.52.108]
Click to expand...
?
 
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