In the UIM 8.51 and Windows Platforms, by some reason, lots of UIM probes are down and specifically telemetry probe is DOWN even if its security validation and restarting its probe.
After Nimbus Controller service is restated it shows as GREEN however port number is not assigned. Another symptom is that there are massive dump files in its probe folder as *.mdmp.
It is a defect and reported as # DE278199 .
Version 1.11 is available.
Please upgrade to its version of telemetry-1.1.1-20170330.152516-2.zip from the current version 1.03.
You can verify from data_engine probe at database tab for Windows Authentication Enabled parameter.