Looking for logging into the 5.4.8 Cant site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the 5.4.8 Cant site. After that you can login as usual with your login credentials.
http://forum.monster-wow.com/index.php?/topic/26511-cant-log-on-in-548-you-must-log-in-with-a-battlenet-account-username-and-password/
https://us.battle.net/forums/en/wow/topic/12926602568
https://eu.battle.net/forums/en/wow/topic/12428042697
http://forum.warmane.com/showthread.php?t=319037
https://www.wowhead.com/forums&topic=220791
https://www.vbulletin.com/forum/forum/vbulletin-5-connect/vbulletin-5-connect-questions-problems-troubleshooting/vbulletin-5-support-issues-questions/4390538-can-t-log-in-to-admincp-after-upgrade-to-5-4-1
https://www.linuxquestions.org/questions/linux-newbie-8/cant-login-locally-keep-getting-login-prompt-over-and-over-on-redhat-linux-5-4-a-937549/
http://us.forum.firestorm-servers.com/index.php?/topic/10483-cant-login-why/
https://worldofwarcraft.com/en-us/news/14167556/5-4-8-patch-notes
https://books.google.de/books?id=0XzJAgAAQBAJ&pg=PA194&lpg=PA194&dq=5.4.8+cant+login
https://github.com/afterlogic/webmail-lite-8/issues/2
https://www.ownedcore.com/forums/world-of-warcraft/world-of-warcraft-emulator-servers/wow-emu-general-releases/484127-5-4-8-mists-of-pandaria-core-dev-apex-team.html
https://community.ubnt.com/t5/UniFi-Wireless/5-4-16-Login-error/td-p/1943351