Issue with one user only, exceeding connections

[Jeremy Schaeffer]

Ok, more information. I closed all my clients and checked the connection 
count. It was still at 57, so I cleared the user with "doveadm kick", 
count was then 0. I launched Thunderbird again and the count went to 16, 
then started my tablet and it when to 3.

I am thinking I still have a issue as why when I closed all the clients 
I still had 57 threads/connections open, and after Thunderbird settled 
down it dropped its connections to 3, but over time that connection 
count rises.

In the 5 min while writing this the connections jumped to 30.

I turned off Wifi on my tablet so the client would use a different IP, 
the connection list went to 41

Now it went back to 59 open connections. I turned my tablet back off, 
its staying at 59. I kicked the user again. I am going to keep my tablet 
off, maybe it's the one causing this.

Is there a way to find more information about what is going on in one of 
the pids? It would seem like one of the clients is opening up a 
connection and for some reason its not dropping and it keeps just 
opening up new ones, but there are no errors in the log files. Once I 
turn off the client the connections are not clearing.

  - Jeremy

On 6/9/2022 11:44, Jeremy Schaeffer wrote:
> Thanks for the command, that is very useful.
>
> That user is actually me, I know why where are so many open. I have my 
> computer, and two tablets, and since I am using server side filtering 
> (procmail) I have to set watch on all the folders that are filtered to 
> or I miss a email. But I am doing the same for about 4 other users 
> accounts I also monitor, so I am not sure why it's just my username 
> that is doing that. I am going to shut down all the clients one at a 
> time and see what client is opening all those connections.
>
> Once I close the client, I assume the connection should also close and 
> the count go down, correct?
>
> I turned off both tablets and the connection count for my username 
> still is at 60, since I am writing this email with my computer client 
> I will send it and close my client and see what happens. Thanks! - Jeremy
>
> On 6/9/2022 11:29, Richard wrote:
>>
>>> Date: Thursday, June 09, 2022 11:07:38 -0500
>>> From: Jeremy Schaeffer <kb9mfd at phonesplus.biz>
>>>
>>> On 6/9/2022 10:59, Richard wrote:
>>>>> Date: Thursday, June 09, 2022 10:46:25 -0500
>>>>> From: Jeremy Schaeffer <kb9mfd at phonesplus.biz>
>>>>>
>>>>> That was the first thing I tried, I lowered the cache connections
>>>>> in Thunderbird. Actually the max connections was 50, not 500, but
>>>>> I could see why as I do have a lot of folders, but what is odd is
>>>>> I have other mailboxes that have even more folders, but it's only
>>>>> one mailbox that is trowing the error.
>>>>>
>>>>> "# ps -axww | grep imap" does not give me the same results -
>>>>>
>>>>> .....
>>>>>
>>>>> 19897 ?        S      0:00 dovecot/imap
>>>>> 19900 ?        S      0:02 dovecot/imap
>>>>> 19901 ?        S      0:00 dovecot/imap
>>>>> 19902 ?        S      0:00 dovecot/imap
>>>>> .....
>>>>>
>>>>> I wish it did give me the mailbox, is there a option to get it to
>>>>> give me that information?
>>>> Try "auxw" on your "ps". I.e., add in the "u" which will get you
>>>> the user detail in the first column, otherwise you just get the
>>>> process id.
>>>>
>>>>
>>> Thank you! That worked, I piped the output to a file, grep the
>>> username and sure enough there are 60 lines. So I guess going over
>>> 50 was a possibility.
>>>
>>> Learn something new every day. I set the maximum to 100 so I should
>>> not have any errors on that anymore.
>>>
>>   Rather than simply upping the limit I think a reasonable question to
>> ask is why/how they are managing to do that. That's a lot of open
>> folders.
>>   By the way, the single command:
>>     ps auxw | grep imap | cut -d" " -f1 | sort | uniq -c
>>   will get you a nice list with the users and their connection counts.
>>
>