Invalid URI: The format of the URI could not be determined. (4375810)

Invalid URI: The format of the URI could not be determined.

Try to get agent communication working on a new deployment.
Test agents deployed are not registering with the console, event logs shows unable to register.
Error seems to be about invalid permissions, possibly on the url (ie. IIS).
 

Try re-installing the agent without 8080 (the <:port> part is optional) eg. http://btserver.lab.com/adm/api "the connection uses port 80 by default."

Also, You can test this by opening a web browser on the end-user device and navigating to  

http://btserver.lab.com/adm/api vs  http://btserver.lab.com/adm/api:80 vs  http://btserver.lab.com/adm/api:8080

you should see the IIS default welcome page when they have entered a valid path, and that path is what they should enter before /adm/api in the installed.