dovecot - Feb 2015 - auth: Error: auth worker: Aborted request: Lookup timed out

hi
> I don't know if this is related but I also get quite a few of these
error messages:
> 
> Jan 31 14:10:46 auth: Warning: auth client 0 disconnected with 1 pending
requests: Connection reset by peer
my interpretation:

a) you have a very very bz network ... the other end cannot respond to incoming
requests

   even if your network is NOT bz, eg, no collision blinking on your
hubs/switches,
   you are still having network problems

b) if all of your dovecot tests is on one host  ... disconnect it from the
network
   and see if dovecot's auth finishes its tasks

c) to clean up your network ...
	- use switches ... not hubs .... even inexpensive netgear switches is good
enuff
	- use good 3-6' cat6e cables ... we'll assume the bldg's wiring is
done to bldg specs
		- my guess, you're probably having cabling problems )
	- separate slow devices from faster devices
		eg. separate printers onto its own network with a switch
		in between printers and everybody else 
	- separate 10/100 devices from gigE devices ... do not mix them up on the same
switch/hub
c ya
alvin
> Jan 31 14:13:20 auth: Warning: auth client 0 disconnected with 1 pending
requests: Connection reset by peer
> Jan 31 14:13:20 auth: Warning: auth client 0 disconnected with 2 pending
requests: Connection reset by peer
> Jan 31 14:13:22 auth: Warning: auth client 0 disconnected with 2 pending
requests: EOF
> Jan 31 14:13:26 auth: Warning: auth client 0 disconnected with 1 pending
requests: Connection reset by peer
> 
> maybe around 20-30 per day.
>

Thanks for your tip regarding the busy network.

I am using a one year old Cisco Catalyst 2960S (WS-C2960S-48TD-L) with cat6e
cables and my network should not be overloaded as far as I know. My mailbox and
mail proxy servers are on two different virtual machines on two different
servers. It could be possible that it is something with the virtualization but
my other VMs do not have any connection time outs or anything. I will keep on
searching on the network side.


On Saturday, January 31, 2015 8:40 PM, alvin <alvin.sm at
Mail.Linux-Consulting.com> wrote:

hi
> I don't know if this is related but I also get quite a few of these
error messages:
> 
> Jan 31 14:10:46 auth: Warning: auth client 0 disconnected with 1 pending
requests: Connection reset by peer
my interpretation:

a) you have a very very bz network ... the other end cannot respond to incoming
requests

   even if your network is NOT bz, eg, no collision blinking on your
hubs/switches,
   you are still having network problems

b) if all of your dovecot tests is on one host  ... disconnect it from the
network
   and see if dovecot's auth finishes its tasks

c) to clean up your network ...
    - use switches ... not hubs .... even inexpensive netgear switches is good
enuff
    - use good 3-6' cat6e cables ... we'll assume the bldg's wiring
is done to bldg specs
        - my guess, you're probably having cabling problems )
    - separate slow devices from faster devices
        eg. separate printers onto its own network with a switch
        in between printers and everybody else 
    - separate 10/100 devices from gigE devices ... do not mix them up on the
same switch/hub
c ya
alvin

> Jan 31 14:13:20 auth: Warning: auth client 0 disconnected with 1 pending
requests: Connection reset by peer
> Jan 31 14:13:20 auth: Warning: auth client 0 disconnected with 2 pending
requests: Connection reset by peer
> Jan 31 14:13:22 auth: Warning: auth client 0 disconnected with 2 pending
requests: EOF
> Jan 31 14:13:26 auth: Warning: auth client 0 disconnected with 1 pending
requests: Connection reset by peer
> 
> maybe around 20-30 per day.
>

Am 01.02.2015 um 22:44 schrieb ML mail:
> Thanks for your tip regarding the busy network.
>
> I am using a one year old Cisco Catalyst 2960S (WS-C2960S-48TD-L) with
cat6e cables and my network should not be overloaded as far as I know. My
mailbox and mail proxy servers are on two different virtual machines on two
different servers. It could be possible that it is something with the
virtualization but my other VMs do not have any connection time outs or
anything. I will keep on searching on the network side.
the busy network tip is nonsense since "Connection reset by peer"
means
nothing else as it says "the remote client lost connection for whatever 
reason" and that are most likely *mobile clients* and *bots*

Feb  1 20:24:17 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 20:24:46 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 20:25:18 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 20:26:01 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 20:26:45 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 20:27:34 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 20:37:04 mail dovecot: auth: Warning: auth client 0 disconnected 
with 2 pending requests: Connection reset by peer
Feb  1 20:37:57 mail dovecot: auth: Warning: auth client 0 disconnected 
with 2 pending requests: Connection reset by peer
Feb  1 21:26:39 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:27:49 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:28:33 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:28:51 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:29:35 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:30:19 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:31:03 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:31:39 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:31:47 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:32:31 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
Feb  1 21:33:53 mail dovecot: auth: Warning: auth client 0 disconnected 
with 1 pending requests: Connection reset by peer
>> I don't know if this is related but I also get quite a few of these
error messages:
>>
>> Jan 31 14:10:46 auth: Warning: auth client 0 disconnected with 1
pending requests: Connection reset by peer
>
> my interpretation:
>
> a) you have a very very bz network ... the other end cannot respond to
incoming requests
>
>     even if your network is NOT bz, eg, no collision blinking on your
hubs/switches,
>     you are still having network problems
>
> b) if all of your dovecot tests is on one host  ... disconnect it from the
network
>     and see if dovecot's auth finishes its tasks
>
> c) to clean up your network ...
>      - use switches ... not hubs .... even inexpensive netgear switches is
good enuff
>      - use good 3-6' cat6e cables ... we'll assume the bldg's
wiring is done to bldg specs
>          - my guess, you're probably having cabling problems )
>      - separate slow devices from faster devices
>          eg. separate printers onto its own network with a switch
>          in between printers and everybody else
>      - separate 10/100 devices from gigE devices ... do not mix them up on
the same switch/hub
> c ya
> alvin
>
>
>> Jan 31 14:13:20 auth: Warning: auth client 0 disconnected with 1
pending requests: Connection reset by peer
>> Jan 31 14:13:20 auth: Warning: auth client 0 disconnected with 2
pending requests: Connection reset by peer
>> Jan 31 14:13:22 auth: Warning: auth client 0 disconnected with 2
pending requests: EOF
>> Jan 31 14:13:26 auth: Warning: auth client 0 disconnected with 1
pending requests: Connection reset by peer
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