ClientAliveInterval

[Sayan Chaliha]

Hey guys,

I have one more question: Is it possible to query sshd for settings and
parameters it was configured with? Something like executing SHOW GLOBAL
VARIABLES on mysqld, perhaps?

On Mon, Mar 1, 2010 at 8:28 PM, Sayan Chaliha <sayan.chaliha at webyog.com>wrote:

> @Damien:
>
> Yes, well, I understand that. But I am experiencing some weird behavior
> with libssh... So I was wondering whether it had anything to do with not
> replying to keepalive at openssh.com
>
> Here's what I'm experiencing:
> -- When the app gets disconnected from the OpenSSH 4.3 server, it tries to
> reconnect.
> -- Reconnection and authorization are successful, but libssh fails when
> trying to open a new channel (with some obscure 'unrecognized packet'
> message).
> -- This continues until the ClientAliveInterval has expired.
>
> Anyway, thanks for all the help. I'm now sure that the problem in not with
> my application but rather with libssh. I've gotten in touch with them (ie,
> the developers of libssh) to have this issue solved.
>
> Thanks again for your time!
>
>
> On Sat, Feb 27, 2010 at 5:59 AM, Damien Miller <djm at mindrot.org> wrote:
>
>> On Fri, 26 Feb 2010, Sayan Chaliha wrote:
>>
>> > @Damien, could you also tell me what would happen if the client didn't
>> > respond to that request, and instead tried to create new session and
>> channel
>> > afresh? Would the server send the same message again?
>>
>> A client that is compliant with the protocol _must_ respond, even just to
>> say "I have no idea what this command is". Any response will reset the
>> keepalive timer.
>>
>> > On Fri, Feb 26, 2010 at 12:40 PM, Damien Miller <djm at mindrot.org>
>> wrote:
>> >
>> > > On Fri, 26 Feb 2010, Sayan Chaliha wrote:
>> > >
>> > > > Hi,
>> > > >
>> > > > I am having some trouble with the ClientAliveInterval server
>> setting. My
>> > > > (C++) application fails to start an SSH channel to an OpensSSH
>> server
>> > > within
>> > > > this time-out period if it doesn't reply correctly to this
>> 'keep-alive'
>> > > > no-op that is sent by the server. How is this no-op handled? I am
>> using
>> > > the
>> > > > libssh client library, and I could find no references on how to
>> handle
>> > > this.
>> > >
>> > > Client aliver interval is implemented by sending a global or channel
>> > > request of type "keepalive at openssh.com" with want-reply turned on.
>> > > You shouldn't need to implement anything for this to work - a client
>> > > should return SSH2_MSG_REQUEST_FAILURE if it doesn't implement this
>> request
>> > > type and that should be enough to reset the keepalive watchdog timer.
>> > >
>> > > If you would like to explicitly support it, you can just send an
>> > > approprate SSH2_MSG_REQUEST_SUCCESS (global request) or
>> > > SSH2_MSG_CHANNEL_SUCCESS (channel request) message, but this is purely
>> > > optional.
>> > >
>> > > -d
>> > >
>> >
>> >
>> >
>> > --
>> > Regards,
>> > Sayan Chaliha
>> > Webyog Softworks Private Limited
>> > 2nd Floor, Novel Team Building
>> > #10, 100 Feet Ring Road
>> > BTM Layout 1st Stage
>> > Bangalore - 560068
>> >
>> > +91-9743357501
>> > _______________________________________________
>> > openssh-unix-dev mailing list
>> > openssh-unix-dev at mindrot.org
>> > https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
>> >
>>
>
>
>
> --
> Regards,
> Sayan Chaliha
> Webyog Softworks Private Limited
> 2nd Floor, Novel Team Building
> #10, 100 Feet Ring Road
> BTM Layout 1st Stage
> Bangalore - 560068
>
> +91-9743357501
>



-- 
Regards,
Sayan Chaliha
Webyog Softworks Private Limited
2nd Floor, Novel Team Building
#10, 100 Feet Ring Road
BTM Layout 1st Stage
Bangalore - 560068

+91-9743357501