641553 - Unable to connect to your IMAP server. You may have exceeded the maximum number of connections to this server. If so, use the Advanced IMAP Server Setting dialog to reduce the number of cached connections.

Status: RESOLVED INVALID

(MailNews Core :: Networking: IMAP, defect, P1)

Description

[Brian]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.15) Gecko/20110303 Firefox/3.6.15 (.NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.21022; .NET CLR 3.5.30729)
Build Identifier: 3.1.9

Received the following error message "Unable to connect to your IMAP server. You may have exceeded the maximum number of connections to this server. If so, use the Advanced IMAP Server Setting dialog to reduce the number of cached connections.", when I try receive messages or do a File-Empty Trash command. Tried changing the "Maximum number of server connections to cache" from 5 to 1, and various other combination's, no help. Restarted TB and restarted XP, still fails. I use Google IMAP Sever.

Reproducible: Always

Steps to Reproduce:
1.Get all mail messages.
2.File, Empty Trash
3.
Actual Results:  
On Mail Toolbar, Get Mail, Get All Messages, 

Expected Results:  
Get the above error message.

Comment 1

[Brian]

First got the problem on my laptop via. wireless, today I got it on my desktop.

Comment 2

[Brian]

Problem was Firewall Setting on Verizon DSL Westell 7500 modem.  It was set to 	Typical Security (Medium), changed to Minimum Security (Low).

Comment 3

[Ludovic Hirlimann [:Usul]]

(In reply to comment #2)
> Problem was Firewall Setting on Verizon DSL Westell 7500 modem.  It was set to 
>    Typical Security (Medium), changed to Minimum Security (Low).

Thanks for the update.

Comment 4

[najoll]

There is a problem here. It's this: Thunderbird doesn't tell you *which* email server has the problem - and so one is left unsure how to fix the problem.

Also, in general, this error report window is a mess - see the image here, which shows the window as it appeared at the very bottom of my screen: https://imgur.com/a/Gx4Uf

Comment 5

[JoeStam]

If you are an AVAST user, here are some news about the problem.

Thunderbird clashes with AVAST!. It totally blocks almost all of the IMAP communications, it is responsible too for the other problem i encountered (many of you too, as i see on the forums) of the too many cached connections on IMAP servers!
If i shut down protection by AVAST i can add as many email accounts as i like and it authenticates. If I leave it running it doesnt let Thunderbird authenticate, it multiplies the cached connections so that you cant receive mails, it totally ruins the Thunderbird services.

I dont know if it is AVASTs programming error or Thunderbirds', but i know that you shouldnt turn off antivirus when receiving emails that nowdays are full of viruses.