[nginx 404 - 6.10 Upgrade]

thats the trick though, myserver plugin was not installed in my case and had unregistered the hostname for letsencrypt ssl a long time ago.  IP login even with broken SSL had worked up until i updated to 6.10 stable from 6.9.2

[nginx 404 - 6.10 Upgrade]

it may be a little more complicated then that.  poking it some more and it looks like it is going off of the full hostname if you had ever previously registered the myserver plugin for ssl or to a custom hostname.  I had to use hostname.domainname.net to get the hostfile to work correctly.

[nginx 404 - 6.10 Upgrade]

in windows the hostfile is at C:\windows\system32\drivers\etc\hosts

hostname anonymized below:

192.168.10.254 myhostnamehere

just submitted bug report to describe my findings

[nginx 404 - 6.10 Upgrade]

I have found that this may be due to the new additions involving Letsencrypt.  My system would not connect by IP.  Added a hostfile entry that points to it and BOOM i was able to connect.