The best troubleshooting tool is a traceroute to see where traffic is getting stuck.
1. Using a Traceroute
Use ICMP-based traceroute in one of these ways:
Issue 'tracert' from a Windows host
Issue 'traceroute -I' from a Linux host
Issue 'traceroute -P icmp' from a BSD or Mac host
You can also issue 'telnet myip.fixr.net' to check what IP address your request is being sent from. This can diagnose firewall/proxy issues.
2. Contacting Support
If a traceroute doesn't help you solve the problem, please send the following information to Support: