Any one see why this doesn't work?

I'll add that your probably aborting the connection because CHECK is not getting defined as a variable and then when you try to insert the CONN header, it runs into a Tcl error. You should check your /var/log/ltm file for any rule errors - I'll bet you'll find some.

You may want to add this to your if matchclass:

else {
   set CHECK "NO"
}