Had the same issue. The problem is with a TA-tenable app and with "ModuleNotFoundError: No module named 'urllib2'" urllib2 is no longer supported. Fixed this issue: 1) delete TA-tenable directory from apps directory on all search nodes 2) install a new version of this app from https://splunkbase.splunk.com/app/4060/ 3) restart splunk Just app reinstall without manual deleting will not help.
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