Deafness

[Steffen Kaiser]

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On Tue, 28 Jul 2015, Steffan Cline wrote:

please, don't top post.

> I checked 993 since I was using SSL for sending/receiving but imagine it’ll look the same if I check any of the other ports.
>
> When I tested via telnet, I checked from my home, not on the server to itself. “telnet host.com imap”

Then take Chris's suggestion into account and re-try from localhost in 
order to rule out network problems.

> I don’t have an answer for you on the state yet since it’s working at the moment.
>
> As far as which processes, I try to connect and no matter what, I don’t get the greeting in this state.

Can you connect to other ports of the machine? Or perhaps ping?
If the network simply drops all packets, you would get your described 
problem easily, incl. the SYN_RECV connections.

>
> On 7/28/15, 10:53 PM, "dovecot on behalf of Steffen Kaiser" <dovecot-bounces at dovecot.org on behalf of skdovecot at smail.inf.fh-brs.de> wrote:
>
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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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>
>

- -- 
Steffen Kaiser
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