Reference number: CH000609

Unable to telnet to other computer.

Question:

Unable to telnet to other computer.

Cause:

This issue could be caused by any of the below possibilities.

1. Bad network address.
2. Port not open on computer or device attempting to telnet to.
3. Permission settings prohibiting telnet.

Answer:

Bad network address

Verify the address you are attempting to telnet to is a valid address. This can be easily and quickly verified by pinging the computer or device. If you are unable to ping the address you are attempting to telnet it is possible that the address is wrong or you have network settings prohibiting you from getting to that address.

Verify the port you are using is correct. By default the telnet port should be 23. However, some network administrators / users may change the telnet port to a different address for security reasons.

Port not open on computer or device attempting to telnet to

By default many operating systems will disable port 23 / telnet access on a computer. In order for you to be able to telnet to a computer that port must be open and the telnet service must be enabled on the computer.

Permission settings prohibiting telnet

Verify you have the permissions to telnet from your computer over the network and to another computer. Verify no firewalls between you and the computer or device you are attempting to connected to are preventing data from getting through and verify telnet service is enabled on both computers.

Additional information:

• See our dictionary telnet definition for additional information about telnet and related terms.