Adobe Acrobat is asking for Proxy server username password

We have changed firewall roles and now when users open a PDF files with ADOBE ACROBAT DC it asks to sign in with Adobe Id. After successfully signing in it asks to enter proxy server username and password like this:

Message: "Please provide your proxy server username and password"

If you give me the site that ADODE try to contact I will insert it in the firewall's  allowed sites

Thank you