IBM Support

How to check connectivity over port 1352 with Telnet

Technote (FAQ)


Question

Lotus Notes clients and Domino servers are unable to establish connectivity with a particular Domino server. You suspect that the problem is due to a firewall blocking port 1352 (the well-known port for Notes/Domino).

Answer

Using Telnet, you can determine whether a TCP/IP connection problem is due to a misconfiguration in Notes/Domino, or is the result of a network problem.
Telnet ("telnetting") provides a better means of testing connectivity than Ping. This is because Telnet tests for connectivity over a specific port. Also, Telnet is much more thorough in its method of connectivity. Ping is like calling a phone number and hearing the ringtone at the other end; Telnet is like calling a phone number and someone picking up and answering.

NOTE: There are many other utilities for testing port availability. Some are easier to use (such as NotesConnect, Jping, Putty); however, since most users already have Telnet installed on a client machine, Telnet will be explored as a tool for testing connectivity in this Technote.

Steps to Telnet to a Domino server over port 1352 (using the command line Telnet utility found in Windows XP) -- see note below for info about Windows 7.

1. Click Start -> Run.
2. Enter Telnet and click OK.


You will see the Telnet command line interface.

3. Turn on local echo so you can see the commands you are typing by entering the following command:
    Microsoft Telnet> set localecho


4. Connect to the Domino server over port 1352 by entering the following command:
    Microsoft Telnet> open yourserver.domain.com 1352

If you can not connect, it means that the port is being blocked outside of the Notes/Domino environment. A firewall might be blocking the port, or the Domino server may not be running. Have the network administrator
check the network configuration for hardware or software that might be blocking the port.

An unsuccessful connection attempt will look like this:



If you can successfully connect, it means that the port is not blocked. You will see a message that looks like this:

5. At this point, you will want to confirm the status of your connection. Enter the following command:
    Microsoft Telnet> Ctrl + ]

When you enter the above command ('Control key plus right bracket'), you will be brought back to a command prompt with a flashing cursor that looks like this:

Next, enter a status command and you will see the following if you are connected:
    Microsoft Telnet> status

If you are connected to the Domino server over port 1352, you will see the following message:


    Note: Windows 7 does not have Telnet enabled by default.
    To enable Telnet on Windows 7:

    Start -> Control Panel
    Programs And Features
    Check Turn Windows features on or off
    Put a check on Telnet Client
    Hit OK

Related information

A simplified Chinese translation is available

Document information

More support for: IBM Domino
Networking

Software version: 7.0, 8.0, 8.5, 9.0

Operating system(s): Windows

Reference #: 1248258

Modified date: 02 May 2008