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[JasonGoldsmith 0]

According the the log
I work at an managed service provider and I was tasked with what this issue is. 

2018-01-07 21:10:52 Error: CReplicationModule [Thread 1274]: CReplicationManager: Replication (network) connection to 'host: "localhost" port: 2222' failed with: Receive: NodSslWriteEncryptedData: Incorrect/unknown certificate or key format.
2018-01-07 21:11:12 Error: CAgentSecurityModule [Thread f48]: Certificated user verification failed with: NodVerifyCertificateChain failed: NodVerifyTrustResult: 42, NVT_NotTrusted, X509ChainStatus: 0x10000, X509CSF_PartialChain
2018-01-07 21:11:12 Error: NetworkModule [Thread 730]: Verify user failed for all computers: ::1: NodVerifyCertificateChain failed: NodVerifyTrustResult: 42, NVT_NotTrusted, X509ChainStatus: 0x10000, X509CSF_PartialChain
2018-01-07 21:11:12 Error: NetworkModule [Thread 730]: Receive: NodSslWriteEncryptedData: Incorrect/unknown certificate or key format., ResolvedIpAddress:::1, ResolvedHostname:, ResolvedPort:2222
2018-01-07 21:11:12 Error: NetworkModule [Thread 730]: Protocol failure for session id 457, error:Receive: NodSslWriteEncryptedData: Incorrect/unknown certificate or key format.
2018-01-07 21:11:12 Error: CReplicationModule [Thread be0]: CReplicationManager: Replication (network) connection to 'host: "localhost" port: 2222' failed with: Receive: NodSslWriteEncryptedData: Incorrect/unknown certificate or key format.
 

 

Any Help Would be greatly appreciated.

[MartinK 376]

This error means that AGENT connection to localhost:2222 is rejecting SERVER's certificate, because it is missing CA certificate.

Any chance SERVER's certificate has been changed? Regardless of that, I would recommend to create new AGENT installer (new should contain correct CA certificate) and try to repair AGENT installation.