This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox doesn't send the TCP FIN flag when the server has been sent it.

  • 2 respostas
  • 1 has this problem
  • 1 view
  • Last reply by iwo_andonow

more options

I have test web server that do redirect (304) when a button on a web page is clicked and tries to close the TCP socket with flags FIN and PSH. Firefox acknowledges the packet with no FIN flag set causing the server to re-transmit the message many times. I'm attaching Wireshark captured packets.

I have test web server that do redirect (304) when a button on a web page is clicked and tries to close the TCP socket with flags FIN and PSH. Firefox acknowledges the packet with no FIN flag set causing the server to re-transmit the message many times. I'm attaching Wireshark captured packets.

All Replies (2)

more options

Is the behavior different on other web browsers? I think 304 is not a redirect. It is 'not modified'. Try using Firefox menu 'tools' -> 'Web Developer' -> 'Network' , it may give some pointers.

more options

Thank you for your advice! I'll investigate what happens through the 'Web Developer' -> 'Network'. I was using 304 with another web page that is not in the browser cache to force the browser to open another socket and load the page. I saw that in some example and I'm not sure that it is the most correct way of doing that. I tried the same scenario with IE11and it looked much cleaner: server sends FIN+PSH, client sends ACK+FIN, server sends ACK and the socket gets closed. I think I need to dig into the problem more and to narrow it down before you spend time on this. Thanks once again for the advices! PS: I can't upload here Wireshark packets file anymore.