Error for unable to obtain a node locked or floating license

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I am an official user for a few week, but today it goes out of this error warning frequently and I can’t access to my fdtd, what’s going wrong with it?

Please see this KX article:

This is a connection issue. Check that you are able to connect to the license server with IP address: 10.126.75.199
You might need the assistance of your IT department and make sure that they did not change any access or security settings on your network.

-Lito

Thank you!!

You are welcome.

-Lito