Answerhub: There was an error contacting the remote service

Dear Stephen,

I tried to login into “https://udn.unrealengine.com” my login Data seems correct.

Since: If I go to unrealengine.com it redirects me to “The most powerful real-time 3D creation tool - Unreal Engine” and I’m logged in.
udn.unrealengine.com

After my login attempt it on “https://udn.unrealengine.com” redirects me to “https://udn.unrealengine.com/oauth/error.html” stating the following:
“There was an error contacting the remote service”

After the login attempt every other call of https://udn.unrealengine.com redirects me to the upper error page. Emptying the Browser Cache logs me off and let me open the login page again.

Please help me fix that issue.