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# [http://portforward.com/help/portcheck.htm PFPortCheck Program]: check TCP/UDP port from localhost(where you installed the program) to portforward.com | # [http://portforward.com/help/portcheck.htm PFPortCheck Program]: check TCP/UDP port from localhost(where you installed the program) to portforward.com | ||
# [http://technet.microsoft.com/en-us/sysinternals/bb897437 TCPView for Windows] | # [http://technet.microsoft.com/en-us/sysinternals/bb897437 TCPView for Windows] | ||
=== troubleshooting steps === | |||
We met the trouble on WAN | |||
* testing on localhost: | |||
** Is service alive? | |||
** with iptable limit? antivirus limit? | |||
* testing on LAN: Is service alive? (often without firewall limit) | |||
** double [[Testing#check_the_server.2Fservice_logs | check the server/service logs]] | |||
* find the problem occurred: (1)local service (2)server to LAN (3)server to WAN | |||
== user client node == | == user client node == | ||