An application using TCP 2000 port can't pass through PIX

zywvip — Fri, 21 Feb 2020 08:30:23 GMT

I have a game application using tcp 2000 port. I have captured packets during connection.

Client to Server -- TCP -- 1115 -> 2000 syn seq=0, ack=0

Server to Client -- TCP -- 2000 -> 1115

Syn ack seq=0,ack=1

Client to Server -- TCP -- 1115 -> 2000

ACK seq=1,ack=1

Then

Client to Server -- TCP -- 1115 -> 2000

PSH ACK seq=1,ack=1,len=50

In a successful connection,

the next packet should be

Server to Client -- TCP -- 2000 -> 1115

PSH ACK seq=1,ack=51,len=10

But through the pix,

the next packet will be

Server to Client -- TCP -- 2000 -> 1115

ACK seq=1,ack=51,len=0 without the PSH flag set.

Client to Server -- TCP -- 1115 -> 2000

PSH ACK seq=51,ack=1,len=50

Server to Client -- TCP -- 2000 -> 1115

ACK seq=1,ack=101,len=0

And then the process comes over and over

Can anyone tell what's wrong with the application? Does it have something to do with the fixup protocol skinny? Thanks in advance!

Re: An application using TCP 2000 port can't pass through PIX

zywvip — Sat, 05 Nov 2005 01:52:26 GMT

I hope I have provided enough information.

Can someone help me.

I just can't find a way out about this problem.