Before getting into changing IPs and all -- Have you tried another system on your network to play the game? Does it work?
I did change static ip to a much higher number in last group (was 70 now 100) to make sure there's no confusion (and it's still within dhcp range). Didn't hurt nuttin'.
By "system" do you mean computer. If so 'no'. Otherwise not sure what you mean.
On the system that can't connect with other users, try using a different user account. If none are created/available, activate the Hidden Admin user account and try it -
https://www.sysnative.com/forums/wi...er-account-windows-8-1-8-7-windows-vista.html
Went to this link but I have concerns with SIM's comment about him being locked out. Is the only way to recover is to run System Restore? Is there a "cleaner" way of doing this? I have never heard of a hidden Admin User account.
Regards. . .
jcgriff2