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Opera PMS SFTP connection failed with DH GEX group out of range error

Sukanya MMay 3 2024

We have an SFTP server with Ubuntu 14 server and we migrated it to Ubuntu 22.

Now some of the Opera PMS clients that use SFTP export delivery method, unable to connect to the new server.

The error we could see in the logs:

---sshd[175263]: ssh_dispatch_run_fatal: Connection from 5.190.4.1 port 51606: DH GEX group out of range [preauth]

Is there any change in openssh configuration of Opera PMS 5.5 and 5.6 versions?

As per our investigation, newer opera pms versions can connect to Ubuntu 22 and older versions failed.

Added on May 3 2024

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