Thread: Calibre-Server and Port Forwarding Issues
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Old 01-27-2016, 09:13 PM   #5
davidfor
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If the port forwarding on the router is configured correctly, it is probably your ISP. Some will block external access to most ports. Some will only block 25, others "known ports", some others everything except those "known ports" and then others just about everything. Things like Teamviewer will run because the connection is started from inside the network over ports 80 and 443. With this, you are actually communicating via the Teamviewer server.

Looking at the WAN settings, that suggests the ISP isn't allocating you an public IP address. That looks like they are using private IPs and then NATing them in their network. Or do you have another router or modem between this one and the ISP?

You might get some information by doing a traceroute from your PC to some external IP. How useful it will be depends on the devices along the way being configured to respond properly.
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