AT&T 2Wire Modem blocks all incoming traffics

Situation: The client switched their ISP from Comcast to AT&T. He has followed this page to modify the public IP address and WAN settings.

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He can access the Internet. However, the Internet users can't access the web sites host by the inside server and can't access the server remotely. All ports are blocked.

Resolution: By default all incoming traffics are blocked by AT&T 2Wire Modem. You may have two options.

1. Go to Settings>Firewall, select the application or create a new port to forward it to the inside computer IP address. Or select allow all traffics as shown below.

2. call AT&T tech support to assign the public IP address to the router behind the AT&T modem or forward all port to the computer or setup the router as DMZ.

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