Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. If the Answer is helpful, please click " Accept Answer" and upvote it. You may find phone number for your region accordingly from the link below: There are two primary purposes for the TIMEWAIT state. Dropping the value, particularly for VPN connected users, can result in constant recreation of proxy tunnels on the outbound connection. I would suggest you open a case with Microsoft where more in-depth investigation can be done so that you would get a more satisfying explanation to this question. setting the tcpreuse is more useful than changing timewait, as long as you have the parameter (kernels 3.2 and above, unfortunately that disqualifies all versions of RHEL and XenServer). Step3: Go to WAN > Internet Connection tab. Please understand, analysis of network traffic is beyond our forum support level. Note: Please refer to Wireless Router How to enter the routers GUI to learn more. To narrow down the issue, I would suggest collect network traffic for further troubleshooting. Number of connectivity Problems with network connectivity. The RPC service or related services may not be running. After that, all the routers send the packets at the same time, and (d) SWAP: SWAP breaks the deadlock at the cost of misrouting A3. Issue 1 All the TCP/IP ports that are in a TIMEWAIT status are not closed after 497 days from system startup. I would suggest you focus on RPC error for this issue.įor RPC error, common causes of RPC errors include: Please refer to the following screenshot.įrom Network perspective, TCP TIME_WAIT status is just a normal behavior that after closing the session, TCP stack will hold the high port for little more time to ensure the other side receive the last FIN-ACK packet and no more data will be received in this conversation. For the maximum, it can stay in TIME_WAIT for 4 minutes known as two MSL. The solution was to turn off both TCP window scaling and TCP timestamps on our servers that are accessible to the public.TCP TIME_WAIT is a normal TCP protocol operation, it means after delivering the last FIN-ACK, client side will wait for double maximum segment life (MSL) Time to pass to be sure the remote TCP received the acknowledgement of its connection termination request. Now I just need a server side resolution (we can't make all the clients do this) :) Turning off window scaling on the client stopped the issue from happening. We are using Fedora 12 Linux as the OS and Nginx as the web server. After the client has sent many SYN packets, the server finally responds with a SYN/ACK packet and everything is fine for the remainder of the connection.Īnd, of course, the kicker to the problem: it is intermittent and does not happen all the time (though it does happen between 10-30% of the time) We've managed to track down the technical signature of this problem, but can't figure out why it is happening or how to fix it.īasically, what is happening is that the client's machine is sending the SYN packet to establish the TCP connection and the web server receives it, but does not respond with the SYN/ACK packet. Lately, we've become aware of a TCP connection issue that is mostly limited to mac and Linux users who browse our websites.įrom the user perspective, it presents itself as a really long connection time to our websites (>11 seconds).
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