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Telnet Port 23.

Issue

Port 23 is opened through Telnet and can provide a security access breach into a system.

Product Line

TAC INET

Environment

All versions of I/Net Software on All Supported Operating Systems.

Cause

When the Delta Debug tables are set to 1 or 2, it opens up port 23 for use but also Telnet can be used as well.

Resolution

The following steps need to be followed to resolve this issue:

  1. Go to Run and type regedit
  2. Open up HKEY_LOCAL_MACHINE
  3. Expand the Software tab and expand CSI-Control Systems International
    1. On x64 Based Systems the above folder is located under the HKEY_LOCAL_MACHINE\Software\WOW6432Node
  4. Open up the Configurations tab and click on the Active Configuration that is currently running in I/Net
  5. On the right side window, scroll down to Debug Tables, right-click and modify the setting
  6. Change the value to a 0, close out of it, close I/Net and I/o server and restart it again.

P.S. This should close that port but be aware that Telnet would not be able to function when this is done.

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