up vote 0 down vote favorite
share [g+] share [fb]

I've got an application that used to work perfectly with all outgoing ports open and all incoming ports closed. Now we've closed all outgoing ports except a few specific ones e.g. http and it's not working any more. Is there a way I can find out using tools like wireshark which outgoing request is getting blocked so I can tell my sysadmin what to open?

link|improve this question
I should mention I tried looking at vendor documentation, etc. – configurator Jan 24 '11 at 20:45
1  
Have you tried contacting the vendor's support to ask which ports are used? – jscott Jan 24 '11 at 20:47
1  
Have you tried using netstat to show you which ports? – John Gardeniers Jan 24 '11 at 23:42
feedback

2 Answers

up vote 3 down vote

It should be listed in your firewall's log. If you don't log blocked outgoing traffic, turn this on at least until you know what to open.

link|improve this answer
+1, Wireshark will also show TCP SYN packets trying to open the connection and should have the destination port listed there too. – Chris S♦ Jan 24 '11 at 20:52
feedback
up vote 1 down vote

Use this app http://www.netlimiter.com/ and it will list out all the connections/ports/addresses that any app running is using.

link|improve this answer
feedback

Your Answer

 
or
required, but never shown
discard

Not the answer you're looking for? Browse other questions tagged or ask your own question.