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Second WAN Port goes to "WAN State: Down" on ISA570W


we installed a new network infrastructure in our new office and we have a problem concerning our Internet Connection.

We have two WANs with attached DSL modems which dial via PPPoE to different ISPs.

We want to have load balancing between these two connections.

Our problem is now: The second WAN is not routed, however the connection is up and running, it simply doesnt route the port (WAN State:down). We can access the IP from outside and everything works fine. If we reconnect to the ISP the WAN State stays up for about 40seconds and then it goes down.

In the documentation it says:

Shows if the WAN port is active or inactive for routing. If the WAN port is active for routing, the WAN state shows “Up.” If the WAN port is inactive for routing, the WAN state shows “Down.” NOTE: The state “Down” means that the network detection fails. Even though the WAN state is down due to network detection failure, the WAN services (like SSL VPN and Remote Administration) can still be connected except the IPsec VPN Access service.

Beside of some NAT and DDNS we have no special configuration. We tried a different modem, changing the ports, but it doesnt help.

Does somebody have an idea what is going on here?


Dear Johannes,

Thank you for reaching the Small Business Support Community.

I would like you to please upload a screenshot of your current WAN2 configuration, I am wondering about keep alive, idle time, MTU settings there and please include the Dual WAN settings config as well.  Is there any Policy Based Routing configured? Please detail if so and try to turn that off if possible just to make sure that's ok. Does the DDNS status shows active? Please screenshot the details too.

Notice that in order to have an engineer work on your case on a more expedite manner, you can contact the Small Business Support Center directly, otherwise I'll be more than willing to assist you.

Thank you for your time and patience,

Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer

*Please rate the Post so other will know when an answer has been found.

Jeffrey Rodriguez S. .:|:.:|:. Cisco Customer Support Engineer *Please rate the Post so other will know when an answer has been found.

The problem is located in the "Failover Detection" section of the WAN.

Somehow one of our ISP blocks Ping Detection (Germany, Europe). When we switched to a higher DNS detection the second WAN port stayed up.

As we have two ISPs the WAN Ports behave differently. The issue occured only with one of them.

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