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01.08.2006 at 05:06AM PST, ID: 21688363
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TCP outgoing port problem

Zone: Sun Solaris
Tags: port, solaris, tcp, outgoing
Hi,

I have a TCP IP program that runs on Solaris 8. It uses user defined outgoing IP port instead of setting it to "ANY" outgoing port available setting. My TCP program is running fine for a while but after some time, it will crash. When I try to restart the program, it fails to connect to the remote server. When I issue netstat -a, I can only see that the status is "SYNC SENT" instead of "ESTABLISHED" for my program connecton status. I am not sure on what could have resulted in this. I changed the outgoing port to another value and the program starts running and get connected again (temporary).

Is there any other solaris utilites that I can use to further trace the cause of the problem?

Thanks.

CM
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Question Stats
Zone: OS
Question Asked By: mussorgsky
Solution Provided By: Computer101
Participating Experts: 3
Solution Grade: A
Views: 0
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01.08.2006 at 02:32PM PST, ID: 15643976

Rank: Master

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01.09.2006 at 01:04PM PST, ID: 15653915

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01.09.2006 at 06:10PM PST, ID: 15656502

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02.15.2006 at 03:02PM PST, ID: 15966128

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02.20.2006 at 07:12AM PST, ID: 16000547

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01.08.2006 at 02:32PM PST, ID: 15643976

Rank: Master

Seems to me that the first order of business would be to figure out why the program crashes and fix that. The other problem should then go away. I think what you are seeing is the natural result of the kernel not knowing that the port is no loger in use because your program didn't close it. The kernel should eventually time out (after a few miutes) the port and close it.
 
01.09.2006 at 01:04PM PST, ID: 15653915
snoop -d {INTERFACE NAME} port {PORT NUMBER}

might help
 
01.09.2006 at 06:10PM PST, ID: 15656502
Hi,

After much investigation, I found that the TCP/IP connection to the remote servers areunstable.

This could be due to my recent testing which requires us to pull out the LAN cable and putting it back and also to use ifconfig to bring the interface UP and DOWN.

My application is very unstable now. Its client outgoing port becomes occupied and unsable after 8 hours of running without problems.. I try to re-run the application and now it fails to connect to the remote server. Is there a utility to check and reset TCP/IP port? Or do I need to perform a reboot on the Solaris 8 server? I re-run my application using another outgoing port and now it is able to connect to the remote server.

Thanks.

Regards,
CM
 
02.15.2006 at 03:02PM PST, ID: 15966128
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I will leave the following recommendation for this question in the Cleanup topic area:
   PAQ with points refunded

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

Venabili
EE Cleanup Volunteer
 
02.20.2006 at 07:12AM PST, ID: 16000547
PAQed with points refunded (125)

Computer101
EE Admin
Accepted Solution
 
 
20080236-EE-VQP-29