Telnet

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Telnet is a simple method of checking whether a specific TCP port is available from a client machine. From a machine that is having trouble contacting a server, use the following steps to verify connectivity to the Registrar service:

1. Open a command prompt.

2. Type the following command:

telnet <Director pool FQDN> 5061

If the window goes blank and only a flashing cursor is seen, it means the connection was successful and the port can be contacted without issue. If the connection fails, an error is returned. Check that the services are running on the Director and that no firewalls are blocking the traffic.

Tip

The Telnet client is not installed by default in Windows Vista, Windows 7, Windows Server 2008, or Windows Server 2008 R2. On a desktop operating system, it must be installed using the Turn Windows Features on or off option found in Programs and Features. On a server operating system, it can be installed through the Features section of Server Manager.

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