On Thu, Jun 28, 2007 at 11:06:23AM +0100, Brian Candler wrote: > TCP SYN --> > TCP RST <-- > > Use tcpdump or wireshark (on client and/or server) if you wish to confirm or > disprove this at the IP layer (*). Note that your switches will never > generated TCP RST packets; only the end hosts participate in TCP. And hence > if this is happening, it's nothing to do with your network infrastructure, > and throwing money at your LAN won't help.
Note, however, that firewalls intercept and participate in TCP. If there is a [stateful or NAT] firewall between the affected clients and the server, it could be causing the problem. For example, it could be reaching a configured state table limit. This is another good reason to capture and analyse the problem properly. In this case, capturing at both client and server sides, and comparing the traces, would be useful. Regards, Brian. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Courier-imap mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-imap
