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Synetech
Asked: 2009-11-27 23:19:17 +0800 CST

What protocols do various web-services (ie ports) use—for unblocking purposes?

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I recently overhauled my router’s firewall rules. I erased everything and added minimal permissions for the ports that I need to be open. However I found that Blogger was no longer able to publish to my system’s FTP server. I was able to fix it by setting my router to allow both TCP and UDP on my FTP port, where I had previously set it to only allow TCP.

Now I’m worried that other things (like HTTP/SVN/MySQL/etc.) could be incorrectly blocked because I have everything else set block UDP—or more accurately, to only allow traffic over TCP on the specified ports.

How can I find out which protocols various web-services use? For example, if I have the router set to allow Subversion traffic on port 3690, should I allow TCP, UDP, or BOTH? What about Telnet, POP3, HTTPS, and so on?

Thanks.

firewall

2 Answers

  1. Very strange that FTP requires UDP ports. Yo can try to run your software that you want to check and simultaneously run "netstat -ano" in terminal, which show you PIDs of processes that produce some network activity. So find with "ps -aux" or taskmanager pid of process you want to check and see of if it tries to connect some port that you're not expected this software to use.

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