@adolfom  you have to use VPN. Port 445 is blocked by internet serviceprovider. 

And thats why.

Ports on the Internet are like virtual doors that data can pass through. All Internet traffic passes through ports to get to and from systems and services across the Internet.

When a certain port is known to be subject to security vulnerabilities, we sometimes block that port on our network.
These ports are blocked at a network level. Traffic over these ports within your local network will continue to operate as normal but will be inaccessible over these ports to devices outside of your network.

Blocked Ports

TCP & UDP ports 135, 137,138 – Used by the NetBIOS service
NetBIOS services allow file sharing over a local network. When exposed to the Internet, it can be exploited to carry out malicious activities such as Distributed Denial of Service (DDoS) attacks or to gain unauthorised access to systems on a local network.

TCP & UDP port 445 – Used by the SMB protocol
Port 445 is vulnerable to a number of attacks which target vulnerabilities in systems running file-sharing services. This port is used by various malware strains to gain entry to a network, namely the WannaCry and Nimda malware variants.