Sounds like your load balancer is not routing the HTTP sessions to the second server when the first is shutdown.

I can access / connect to  the Traveler servers independently. The ShowActive and ShowUser verify this.

We are not using load balancing. The second traveler server is purely for DR. 

The problem is that when using the DR Traveler and I shutdown Traveler or HTTP on the primary server; the Traveler devices I lose the ability to sync.  Only if Traveler and HTTP tasks are running on the primary server do they connect/sync with the DR one.

The method of switching that we are using is to manually change the IP address that our reverse proxy server points too.

It seems to point to a forwarding of HTTP traffic from our reverse proxy server. The think is that I have this pointing to the DR Traveler so I can't see why I have the problem.

If I go to http://server01/servlet/traveler or http://serverdr/servlet/traveler" they both show IBM Notes Traveler Version: 9.0.0.0 Build 201303041735 running on server01 on the User Status page.

I know that DNS names are not pointing to the same servers / IP addresses.

Why would this be happening?

The External Server url is the same on both servers.

Any other thoughts as to what the problem may be?

Thanks

Issue was the web server was allow sending requests only to one server.