How to Perform a Telnet Test [VIDEO]

Article by Andrew Lidstone, CSWE updated June 21, 2015

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When troubleshooting connectivity issues for some SOLIDWORKS products, such as the SolidNetwork License Manager, SOLIDWORKS Workgroup PDM or SOLIDWORKS Enterprise PDM, it’s possible that a ping test may succeed but the communication may still be failing.

A Telnet Test can be very useful in such situations to determine if the issue still is a network communication issue or if it’s an issue with the particular software. The Telnet Test allows you to ensure that a specific port on the target system is open and responding.

Set Up the Telnet Test

To perform a Telnet Test, the Telnet Client needs to be turned on by going to the Control Panel > Programs > Turn Windows features on or off, or by going to Programs and Features and clicking Turn Windows features on or off from there. In the list of Windows Features, check the box beside Telnet Client to enable the feature.

Add remove programs

The Telnet Client will take a few minutes to turn on.

Windows Features Update

Perform the Telnet Test

To perform the actual test, launch the Cmd prompt and type in the command telnet, followed by a space then the target computer name, followed by another space and then the port number. This should look like: telnet host_name port_number. Press Enter to perform the telnet. If the telnet succeeds the prompt will display a flashing cursor, if it fails it will report that it cannot open the connection. The most common reason for a failed Telnet Test is if the Firewall settings are blocking the port.

Cmd Window

Successful Connection

Failed Connection

Common communication ports for SOLIDWORKS products:

SolidNetWork License Manager
TCP port 25734 and 25735

SOLIDWORKS Workgroup PDM
Request: TCP port 40000
Data: TCP port 30000
VaultAdmin: TCP port 20000
Viewer: TCP port 80

SOLIDWORKS Enterprise PDM
Archive Server: TCP and UDP port 3030
SQL Server: TCP port 1433 and UDP port 1434
Web Server: HTTP port 80 and HTTPS port 443