Monitor HTTP Page for Text

I would use i.e. httpfox (Firefox plugin) to verify the requests and responses from scratch. Perhaps a real browser gets redirected (302) first and / or the content will show up only after receiving a session cookie being retransmitted by the client.

 

Actually I had exactly the same issue a couple of months ago with a customer and we simply parsed for a '302'. Ironically we received a '200', if the gateway was inoperable. So you may add the '200' to the monitor disable conditions.