I have a Web Server on Windows Server 2012 r2 on Microsoft Azure. My vendor built a a webpage that I need to access from my on-premise subnet. I created inbound security rule in the Network Security Group allowing my subnet connection to the server via HTTP/HTTPS and I can't connect using DNS name or IP address. When I enabled access to the same page from my vendors IP address, they can easily access it.
Also, I have a VPN tunnel between my Azure environment and my on-premise subnet.
I can easily connect via RDP, but can't over HTTP.
Any advise appreciated.