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I have been working with TAC on an NMAP failure issue since December 2019 and the results are that it is broken. The problem started after upgrading v2.2 from patch 13 to 15. The manual NMAP scan sits on Manual scan in progress... and never populates the Manual NMAP Scan Results page.
TAC confirmed that installing patch 16 does not correct the problem.
They told me today that rolling back to patch 13 did not fix the problem either.
If you may share the TAC case number, I will take a look.
PS: I moved your thread to its own. In the future, please avoid resurrect an older post more than a couple of weeks ago and the circumstances are unlikely the same.