Checking firewall
Posted: Fri Mar 25, 2011 1:46 pmOther useful tools for troubleshooting firewall issues:
PortQry: A command line utility provided by Microsoft that can be downloaded from . You can find usage examples . In order to use PortQry, you will need to know how to open a command line window.
tracert: This is also a command line utility but it is built into Windows. If you type "tracert drivinghealth.com" (without quotes) into the command line you will receive a list of servers that handle the request.
telnet: Another command line utility that tries to make a connection to a server. You can specify an IP address and a port number in the command line.
For a description of how to troubleshoot where the firewall block occurs using tracert and telnet, follow instructions but use following command line for tracert: tracert drivinghealth.com. For telnet, use following command to test access to drivinghealth.com on port 80: telnet 98.130.155.35 80. The example is for troubleshooting SSL connections (https which is port 443) but the instructions are basically the same for non-SSL (http which uses port 80) connections as well.