CentOS - Jan 2015 - C6 server responding extremely slow on ssh interactive

Op 28-01-15 om 17:20 schreef Marcelo Ricardo Leitner:
> On 28-01-2015 11:15, Patrick Bervoets wrote:
>> I have a C6 server acting as a kvm-host.
>>
>> When connecting with ssh the console is extremely slow and hangs for
>> minutes at a time. Connecting to this server is not the problem.
>>
>> If I use: ssh root at host "whatever" I got immediate
response even when
>> interactive consoles opened with ssh are hanging.
>
> Sorry, is it hanging during the session or while attempting to establish a
new one? If this last, it may be dns and ssh -v may help. The former is weird, I
don't think I ever saw it.
>
>   Marcelo
>
Marcelo,

It hangs during the session. Once I'm logged in and beginning to type it
displays 3-5 chars and then hangs for up to 15 minutes, a few more chars, wait,
and so on.
Checked my resolv.conf; added 'options single-request-reopen' though I
don't know if that is helping.

Yes it is weird; even more that individual commands sent with ssh gives
immediate respons.

Thanks
Patrick

Hi Patrick
have you ever tried to find out on which side the hanger is: on the 
client's or on the server's, using tcpumg or the like?
That migth help a bit further on, that might.

suomi

On 01/28/2015 05:41 PM, Patrick Bervoets wrote:
> Op 28-01-15 om 17:20 schreef Marcelo Ricardo Leitner:
>> On 28-01-2015 11:15, Patrick Bervoets wrote:
>>> I have a C6 server acting as a kvm-host.
>>>
>>> When connecting with ssh the console is extremely slow and hangs
for
>>> minutes at a time. Connecting to this server is not the problem.
>>>
>>> If I use: ssh root at host "whatever" I got immediate
response even when
>>> interactive consoles opened with ssh are hanging.
>>
>> Sorry, is it hanging during the session or while attempting to
>> establish a new one? If this last, it may be dns and ssh -v may help.
>> The former is weird, I don't think I ever saw it.
>>
>>   Marcelo
>>
> Marcelo,
>
> It hangs during the session. Once I'm logged in and beginning to type
it
> displays 3-5 chars and then hangs for up to 15 minutes, a few more
> chars, wait, and so on.
> Checked my resolv.conf; added 'options single-request-reopen'
though I
> don't know if that is helping.
>
> Yes it is weird; even more that individual commands sent with ssh gives
> immediate respons.
>
> Thanks
> Patrick
>
>
>
>
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>

Op 28-01-15 om 17:51 schreef anax:
> Hi Patrick
> have you ever tried to find out on which side the hanger is: on the
client's or on the server's, using tcpumg or the like?
> That migth help a bit further on, that might.
>
> suomi
>
Not yet, I'll try that out tomorrow
Thanks
Patrick

Op 28-01-15 om 17:51 schreef anax:
> Hi Patrick
> have you ever tried to find out on which side the hanger is: on the
client's or on the server's, using tcpumg or the like?
> That migth help a bit further on, that might.
>
> suomi
>
I'm not sure what you mean with tcpumg.
But after testing with a physical console I'm experiencing the same problem.
So I guess its the server.

Thanks