415 means, that the peer closed the connection - probably after finding out, that the TLS protocols or cyphers are not compatible.

You should insect the remote logs, why the peer closed the connection.

- https://www.ibm.com/docs/en/db2/11.5.x?topic=encryption-common-global-security-kit-gskit-errors

I know, this is not IBM i - but the information is essentially the same.

HTH
Daniel


Am 23.02.2026 um 17:55 schrieb Jay Vaughn <jeffersonvaughn@xxxxxxxxx>:

GSKit Error is 415 - Peer not recognized or
badly formatted message received

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