After upgrading to 11.2.0.3.0, we had been receiving this error "TNS-12599: TNS:cryptographic checksum mismatch" quite frequently.
Found related information in Oracle support. The thing is - when Enterprise Manager logs in or out from a 11.1 (11gR1) or 11.2 (11gR2) target database or as the OMS database repository, it causes several TNS-12599 errors in the alert.log of the respective database.
This is for the bug 9953045.
Workaround:
1. On the target database side, set SQLNET.ENCRYPTION_TYPES_SERVER= (3DES168) in sqlnet.ora
2. Patches for bug 9953045 will fix the problem.
Found related information in Oracle support. The thing is - when Enterprise Manager logs in or out from a 11.1 (11gR1) or 11.2 (11gR2) target database or as the OMS database repository, it causes several TNS-12599 errors in the alert.log of the respective database.
This is for the bug 9953045.
Workaround:
1. On the target database side, set SQLNET.ENCRYPTION_TYPES_SERVER= (3DES168) in sqlnet.ora
2. Patches for bug 9953045 will fix the problem.
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