How do we do this? "We need to modify Diffie-Helman Groups and make sure diffie-hellman-group14-sha1 is disabled. ... please could you disable the DH group - diffie-hellman-group14-sha1?" - SFTP/SCP server - Free Tools & Trials

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We use Solar Winds SFTP server software. I have been contacted by the people who run our servers with the following, which doesn't mean anything to me.
Is it possible to do what they are asking and how would we do it?

"... the scan discovered Insecure Diffie-Helman Group on Port 22 which is used by the process named as SolarWinsSftpServer.exe.
We need to modify Diffie-Helman Groups and make sure diffie-hellman-group14-sha1 is disabled. ...
please could you disable the DH group - diffie-hellman-group14-sha1?"

Thanks!

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