Symantec Data Loss Prevention Network Discover for SharePoint servers.
SharePoint scans started failing. This started after the Kerberos server was taken off-line for maintenance.
The FileReader logs show "Negotiate Kerberos failed, falling back to NTLM".
NTLM had been disabled on the network for security reasons.
Enable NTLMv2 authentication on the Enforce server.
See our KB article TECH218602 for the steps to enable NTLMv2, link below.
jCIFS and NTLMv2
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This will clear the history and restart the chat.