Creative cloud wont sign in

hi

im new to creative clould, i have downloaded the creative cloud app,

but when trying to sign im i get this error " unable to reach adobe servers, please check your firewall settings"

having tried the solutions suggested, i still cannot logon.

any ideas on how to fix it, is there a URL or web address that i need to allow through web titan?

Machine in windows 8.1,on a domain.

a support rep tried a few things, but it came to nothing, so i have a €700+ piece of software that i can't use.

terrific...

thanks