Teamcity web-interface does not work

Question

I have Teamcity on Windows machine.
When installed it, I selected the 8080 port.
I have another application on the 80 and 443 ports.
It worked fine, but now I see an error:

But if I open localhost:8080 on a virtual machine - all works well.

1. What happened? Maybe you know :(
2. How I can change port or change working to "without SSL"?
3. How I can move all my projects to another Teamcity?

Thanks!

Answer 1

Thaks for all answers. Teamcity began to work correctly when I installed all windows updates to my Windows Server 2012 R2. Maybe it depended with last Microsoft security update.