FIXED - So this was a problem for me all day.

It started as the H202 error and not being able to get into multi-user mode, but then I was getting errors on QB File Doctor saying *QBDBMgrN was not running on this computer".  I tried a clean install of qbmanager, manually adding firewall ports, resetting the firewall settings to default, multiple restarts, etc.

After several hours of my own trouble-shooting about an hour and a half with support, we tried renaming the *.QBW.TLG and the *.QBW.ND with .old (so QB would create new files) files and it not only fixed the problem but greatly sped up QB itself. 

If you've tried all the help articles it might be helpful to take note of the size of the .tlg and .nd files.  I was told if they are too large it could create errors.

For reference, my tlg file was about 1.04GB and my file size itself was 1.9GB