When trying to log in to the Manage Signatures App, you get an error similar to the one below:
Error occurred during logon. Try logging in again. An error occurred while sending the request. The remote server returned an error: (407) Proxy Authentication Required.
It looks like the program cannot connect to the CodeTwo Email Azure Service. The connection might be blocked by your firewall or other applications. Please make sure that HTTPS connections are open for the following hosts:
- and for the FQDN of your CodeTwo geo location. You can find it here.