Login – SSL Handshake Failed

When trying to log in, I get an error message: SSL handshake failed. What can I do?

Answer:

If you see this error message, you cannot connect to our license server to verify your license.

Please ask your IT department to check the communication with our server. It is necessary to enable the following access in the firewall and antivirus policies as well as in the network:

Server name: lm.dlubal.com
Server IP: 89.187.130.211
Server Port: 443
TLS 1.2

If the connection still does not work after this procedure, your IT department needs to check whether the SSL certificate has been exchanged, based on your internal guidelines (for example, using a proxy). They should be able to check this with software (for example, OpenSSL) in the command line:

cd C:\Program Files\OpenSSL-Win64\bin
openssl.exe s_client -connect lm.dlubal.com:443

If you still can't find the cause, try to access the site via a mobile hotspot or from a different location.

Author

Stefan provides support in Customer Support for technical inquiries. Even when dealing with more complex issues, he takes a structured approach and ensures that the results are easy to understand.

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