Email clients not connecting to imap servers

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BarronBarry

BarronBarry

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Feb 9, 2014
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10,510
All my email clients have stopped connecting to their respective servers. I have accounts with 1and1 and gmail configured in Thunderbird, which stopped downloading messages around the 26th Jan on one PC. Thunderbird reports too many imap connections. I can still access these accounts via the web. Other devices in the house can still access them via client apps. So it is only one PC (Win 7) that is affected.

  • I have reduced the number of connections to 1 – no effect.
    I have tried reinstalling Thunderbird - no effect.
    I have tried removing an account and reconfiguring it – during this process Thunderbird is not able to establish a connection to the server.
    I can telnet into the server from the affected PC – so I know I can make a connection.
    I have tried rolling the operating system back to the 20th Jan – no effect.
    I have tried disabling the firewall (AVG Smart Security 5)
    I have run Malwarebytes which found one PUP in a download (probably unrelated) and removed it.
    I have tried using windows live mail, which I used to use and was still installed with the accounts set up – this also will not connect.
    I have tried installing Opera from scratch, it also will not connect to gmail or 1and1.
Any ideas other than wiping the complete system and starting from scratch?

 
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BarronBarry

BarronBarry

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Feb 9, 2014
2
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10,510

I'll see if I can work out how to - I'm not using Thunderbird on all the other devices - I have a mix of Nexus tablets, Macbook Air and Windows PCs. But I don't think it is down to the number of connections as none of the other devices are seeing a problem. I would expect to see the issue moving between devices as they are switched off and on if there was a clash between systems. The issue isn't intermittent - since the 26th this PC will not receive any email from any account unless I use web access.
Also the gmail account is only accessed by my tablet and the PC so it shouldn't have exceeded the 15 connection limit.
 
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gmudgal

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Mar 28, 2014
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Were you able to find a solution to this issue yet? I am facing exactly the same issue on one of my Windows 7 based PCs. All other devices are fine. I uninstalled the Windows patches that were installed since the day that I noticed the problem, I even restored the system to the restore point created before one of the major patches were applied, I re-installed MS Office (originally the problem was seen only in Outlook) but still no luck. I can connect to Exchange servers though - no issues there.
 
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gmudgal

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Mar 28, 2014
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I think, I may have resolved my problem. I could setup my IMAP email account and download my email into Outlook after I disabled my antivirus and firewall. I suspect the culprit must be the antivirus. I still need to see specifically what the issue is.
 
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bytor54

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Jun 3, 2009
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Hope I don't get admonished for replying to a year old thread, but I believe I have something to add that could help someone else with this issue. I encountered this thread when I was having a similar or possibly the same issue. In my situation, it was the Anti-Virus causing the issue. I am running Avira Professional Security, Windows 7, Thunderbird Email Client & IMAP for my Incoming Mail Server setup.

T-Bird couldn't seem to connect to the mail server. It would eventually give a error that connection to the server timed out. However, I could send mail, although even that didn't seem to work quite right.

I found my solution here: http://www.avira.com/en/support-for-home-knowledgebase-detail/kbid/1249

Apparently Avira's Mail Protection feature was stopping the Incoming connection from working properly. Changing the setting in Thunderbird for mail.server.default.use_compress_deflate to FALSE (off). Then restarting Thunderbird, resolved the issue.

I hope this proves helpful for someone else out there.

 
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