Error trying to access my tablet from my PC
In most cases the communication might be blocked by the firewall, on router or on the PC, confirm if port 5544 is allowed in firewall settings.

Second check if your browser uses proxy settings, which allows traffic on a different port altogether (most VPN softwares usually set up proxy connections). In this case either add the server IP as a local address and allowing bypassing of proxy for local address.

Thirdly check if Network Discovery and file sharing  is enabled on both devices. 

Ping and check if addresses are reachable, and set up DNS if needed.

In most cases this should resolve connection timed out or not reachable errors