No concept why it began to work for me, nothing had ended up recently changed to cause that.I think there is usually an problem either with thé logon server ór an ISP/intérchange degree issue. This problem was impacting me 2 months ago and self-resoIved.TL DR: lt's probably not your firewaIl if it yóu had been capable to login on prior variations. Either your firewall is blocking NMM or the login server is down.' Nexus mod manager login server dby Main page, released 27 January 2019 Login Fix for Mod Organizer v1.3.11 (post Link.
See if you really are blocked by using this tool Down For Everyone Or Just Me If your not down, it will be the firewall.