Enhanced Security, Trusted Host name format?

Please help explain if Acrobat requires specific format for trusted web or server hosts, or if there is some other reason why Acrobat may be blocking access to our internal web server.

Our internal network uses a sharepoint server in the format of "http://hostname/"; no "www" and no dots.

File system access is also available as "\\hostname\"

Acrobat is blocking all web and file links to the server. I keep getting Security Block messages that say Acrobat does not allow connection to "hostname"

Tried adding host to the Privileged Locations as "http://hostname/", but Acrobat switched it to "hostname/"

Tried adding folder path as "\\hostname\" but this didn't work either.

I also checked my Windows OS security zones. "http://hostname" is listed as a trusted site. There are no restricted sites.