Publicing my wow private server (stuck at error)

I am stuck at one error i need to be fixed. i am willing to pay 50 dollar for this error to be fixed. For me personally i have tried everything but im not sure i found the scource of the error. So far i got everything on my dedicated server installed my server files sql starter and auth server and world server is running and i see no errors. Then i go open my wow client on my laptop and try to connect to the game, but i am stuck at authenticating instead of being logged into the game. I tried follow guide where i make sure i created noip dns domain and i make sure i change my wow realmlist to the dns domain. I also changed the realmlist in the sql server - auth- realmlist - data template to my external ip of the dedicated server. I also changed the host files in the system32-drivers-etc and adding my external ip of the dedicated server along with the dns hostname. And still it doesnt work. Even though i followed all the guides on the forums and youtube videos i could find i still have error when i log in from my laptop stuck at authenticating. I need this final error to be solved ASAP so my wow server will be running I have login and password ready for the remote desktop for my server so it should take pretty short time for a person who know how to solve this final error to fix this problem for me. PLEASE ONLY ANSWER THIS POST IF YOU ARE 100% KNOWLEDGEABLE ABOUT WORLD OF WARCRAFT GAME AND HAVE A CLUE HOW TO FIX THIS ERROR!. I AM LOOKING FOR SOMEONE WHO HAVE PUBLICED A WOW SERVER WITH SUCCES BEFORE WHERE IT WAS ALL WORKING. !!!!!