Since RH9 migration default crypto policy excludes old algorithms
With RH9 the DB-Server forces a SSL connection to the Client using the following algorithm: SHA1withRSA. If you move to RH9 the crypto-policy will be set to "DEFAULT", which excludes older algorithms, so the client can’t establish a connection to the server.
A similar problem can be found here
Possible solutions:
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Either update the certificate on serverside or
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set crypto-policy to "LEGACY"