EthernetBlaster telnet port

I have an EthernetBlaster. I used it for years but now our Cyber-security people decided to block it from the network due to the open telnet port 23/tcp.

The firmware is at the latest version available.

I can not find an option to disable telnet in the web interface nor any mention of the telnet interface in the documentation.

Is there a way to disable telnet on the EthernetBlaster?

I tried to log in using telnet but I could not figure out what the login/password should be.

Thank you,

Thorsten