[hobbit] Connection problems with bbproxy

[Kasperowicz, Shaun (Contractor)]

I had already been using the --debug and --log-details options, but the
logs weren't telling me much.  I went ahead and ran bbproxy with the
--no-daemon option that you mentioned, and I started seeing quite a bit
more info on screen, including what looked like successful connections:

2005-08-09 15:25:10 state 0: connecting to server
2005-08-09 15:25:10 Connecting to BBDISPLAY at 10.88.19.48
2005-08-09 15:25:10 state 1: connecting to server
2005-08-09 15:25:10 Connecting to BBDISPLAY at 10.88.19.48
2005-08-09 15:25:10 state 0: request sent
2005-08-09 15:25:10 state 1: sending to server
2005-08-09 15:25:10 state 0: cleanup
2005-08-09 15:25:10 state 1: request sent
2005-08-09 15:25:11 state 0: cleanup

I opened the BBDISPLAY web page, and what do you know, it's working!?
However it only seems to work when invoked with the --no-daemon switch,
which really has us puzzled.  I'd like to get it working in daemon mode,
but I'm not sure what the issue is here.

Oh, and I am seeing SYN-ACK packets coming back from the BB server, but
after that there is nothing.  I will get you the snoop files for both
machines asap, if you still want to see them.

Thanks Henrik

-Shaun



-----Original Message-----
From: Henrik Stoerner [mailto:henrik at hswn.dk] 
Sent: Tuesday, August 09, 2005 2:20 PM
To: hobbit at hswn.dk
Subject: Re: [hobbit] Connection problems with bbproxy

On Tue, Aug 09, 2005 at 01:03:21PM -0600, Kasperowicz, Shaun
(Contractor) wrote:
> Well after some more snooping, we find that bbproxy never makes a 
> complete tcp connection with the BB server.  You can see several 
> connection attempts, but they are never completed, and the data is
never sent from bbproxy to the BB server.

I assume what you see in the snoop are the outgoing SYN packets from the
proxy, but not SYN-ACK packets coming back from the BB server ?

Could you run snoop on both servers - the one running bbproxy and the BB
server at the same time ? I'd like to have a look at that traffic.


> The bbproxy never gets that far...as if it's doing something during 
> the negotiation that our old BB server doesn't like, so it drops the
connections.
> I'm beginning to think that our BB1.8b clients and server are too old 
> for us to use bbproxy with them.  Is this possible?  I'm not sure how 
> far back Hobbit is compatible with BB.

It *should* work - I dont think there's been any change in the BB daemon
for a very long time. I haven't tested bbproxy with a 1.8b server, but I
don't know of anything that would make it fail like this.

There's really nothing special in the way bbproxy sets up the connection
to the BB server - it just invokes the standard "connect()" routine.


> Also, is there a way to make logging more verbose with bbproxy?  That 
> might help the troubleshooting.

Start bbproxy as a foreground process with debugging enabled. Run it
with all of the usual options, plus "--debug --no-daemon".


One thing I come to think of ... what's the MAXLINE setting on your BB
server (in the $BBHOME/src/bb.h file) ? bbproxy will combine status-
messages into combo-messages - if it ends up building larger messages
than your BB server can accept, they could end up being discarded. But
then you should see the message going over the wire ...


Henrik


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