Deafness

[Steffen Kaiser]

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On Tue, 28 Jul 2015, Steffan Cline wrote:

> When dovecot stops accepting connections, I checked netstat and found this:
>
> [root at hosting1 ~]#  netstat -an | grep 993
> tcp        0      0 0.0.0.0:993                 0.0.0.0:*                   LISTEN
> tcp        0      0 65.39.x.x:993            184.101.x.x:36351        SYN_RECV
> tcp        0      0 65.39.x.x:993            107.212.x.x:51487        SYN_RECV
> tcp        0      0 65.39.x.x:993            107.212.x.x:51488        SYN_RECV
> tcp        0      0 65.39.x.x:993            184.101.x.x:44650        SYN_RECV
>
> This told me it wasn’t too many connections causing dovecot to be unresponsive. So then I tried via telnet.
>
> Dovecot seems to accept connections but then just sits there and does 
> nothing. I used the appropriate commands to try and initiate a login but 
> nothing happens. Typing any commands at all produce no response from 
> dovecot.
>
> I then do a “service dovecot restart” and then telnet again and get this:
>
> * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN AUTH=LOGIN] Dovecot ready.

from which host do you telnet to Dovecot and to which port?
Do you get the greeting (last line of your quote), if you telnet?
You show port 993 in above listing, which is the IMAP-over-SSL port, you 
should not see the greeting with telnet on this port at all.

In which state are the various dovecot processes in? Do they wait in 
non-interruptable sleep? ps -eopid,user,fname,state,wchan,args

Do all Dovecot processes hang or just new ones, that try to connect and 
auth?

- -- 
Steffen Kaiser
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