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Error: POP3 connection broken in response


tuga

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I've been receiving many emails, at random times of the day, with the following content:

One or more POP3 connections failed:

Sales <sales@site.tld>
Error: Connection error: Can not authenticate to POP3 server: POP3 connection broken in response 

This started after enabling/disabling several modules.

Where should I look to start debugging the problem?

Thank you in advance.

 

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16 hours ago, tuga said:

Where should I look to start debugging the problem?

are you sure that it's related to a module and not the "new feature" of v7.6 mentioned in the thread below that generates an email when there is an error...?

https://whmcs.community/topic/290863-pop3-connection-error/

Quote

Whenever an error is encountered by pop.php, an email is now sent to full administrators detailing the error. In this way you are pre-actively notified when a problem is occurring with email importing, rather than finding out from angry customers whose emails haven't been answered.

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4 hours ago, brian! said:

are you sure that it's related to a module and not the "new feature" of v7.6 mentioned in the thread below that generates an email when there is an error...?

https://whmcs.community/topic/290863-pop3-connection-error/

Hi again Brian,

We didn't perform any upgrade and this problem started after testing several themes, which may also be just a coincidence.

All emails sent to us have been converted into tickets without problems and no costumers have complaint about un-replied emails.

No errors have been logged either on /var/log/messages or apache error log and we've no clue about what to do to solve this.

Thank you.

 

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4 hours ago, tuga said:

No errors have been logged either on /var/log/messages or apache error log

Unlikely you'd see anything in either one about email login issues.

From a shell, try this:
 

less /var/log/exim_mainlog | grep 'username'

The username should be the email account login.

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2 hours ago, bear said:

Unlikely you'd see anything in either one about email login issues.

From a shell, try this:
 


less /var/log/exim_mainlog | grep 'username'

The username should be the email account login.

Hi Bear, thank you very much for your reply.

I'm using CentOS 7 and the correct command is:

less /var/log/maillog | grep 'username'

Which outputs (ip/user changed):

Nov 13 22:58:31 server dovecot: pop3-login: Internal login failure (pid=22883 id=1) (internal failure, 1 successful auths): user=<user.domain>, method=PLAIN, rip=000.000.000.000, lip=000.000.000.000, secured, session=<Rb1jSEKXatWyP0KP>

This seem to be a problem related with davecot (internal failure) and not directly with WHMCS.

I've enabled error log on davecot and should be able to understand what's happening on the next error. I'll post my findings then.

Edited by tuga
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