Cisco Small Business Voice Gateways and ATAs (Linksys Business Series)

Note: This is normally due to a Maximum Transmit Unit (MTU) problem and some secured sites require opening ports. To enable MTU on the router, follow the instructions below.

Enabling MTU on the Router

Step 1:
Determine the proper MTU size for the website.

Step 2:
Access the router's web-based setup page. For instructions, click here.

Step 3:
When the router's web-based setup page appears, set MTU to Manual and enter the proper MTU value on the Size field.

Note: The recommended MTU sizes for DSL and Cable Connection are the following:

Cable Connection: 1500
PPPoE DSL Connection: 1492

Step 4:

Click .

Note: If this did not work, open ports on the router. For instructions, follow the steps below. 

Opening Ports for Secured Sites

Step 1:
Access the router's web-based setup page. For instructions, click here.

Step 2:
When the router's web-based setup page appears, click Applications & Gaming tab then click Port Triggering.

Step 3:
Under Application, type "https" and under Triggered Range and Forwarded Range fields, type "443" (the port being used by https).

Step 4:

Click .