It has always stalled. The only thing I have been discovery thus far is the Windows MID Server itself.

I did it as 127.0.0.1 before and after the SQL WID Change.

I restarted the MID Server. And then built a credential discovering the MID Server by its address. I have yet to see a discovery get to "Completed".

In the Discovery status there is always as many ECC Q outputs as inputs.

I reviewed the MID Server agent log and all the probes that start seem to end, and there is always as the 12 eccsender.1 messages. The only 2 errors of note are

PowershellProbe Slow execution (129ms) of script: probe:WMI: Installed Software

and

PostProbeProcessor: Unable to invoke fcinfo command on the target host