Firewall close TCP port without explanation (during browsing web) under Windows

[HAYES]

I dont know what's going wrong with Windows XP firewall (SP2) in my case. If i keep Windows Firewall disabled than Wireshark can see my browser i.e. is Firefox sending SYN packets in quick succession to my web server. I dont have any issue while browsing but as soon as in enable firewall, some SYN-ACK packets starts dropping and TCP port connection gets closed before receiving SYN-ACK packet because of which my web server turns inaccessible sometimes. I am just running out of ideas as i am not able to make out exact cause of this issue. I have gone through some sites where similar issue has been addressed but i haven't come across any effective solution yet. So any help regarding this issue will be appreciated.

[julio_90]

it would be great if someone would help..waiting for good answers thanks

[juliov]

is this happening to just one computer or any computer running win fwall is having the issue? are there any filtering rules configured on the win-fwall?