Can't access the target server by TELNET with port 23

Document ID : KB000118720
Last Modified Date : 31/10/2018
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I tried to access by the TELNET with port23 by using the TeraTerm. The TeraTerm path settings is the same as SSH. Although the SSH access is succeeded but the access is hang. What should I do?
CA Privileged Access Manager (PAM) r3.x
Try to set the configuration of the TCP/UDP Service. It is not the PAM side reason but the parameter of the TeraTerm side.

 Port: 23:* 
 Application protocol : TELNET 
 Client application: "C:\Program Files (x86)\teraterm\ttermpro.exe" telnet://<Local IP>:<First Port> /T=1 

 Reference) TeraTerm Pro command line 
Additional Information:
The TeraTerm is the terminal emulator. See the TeraTerm Homepage to check it.