Any one see why this doesn't work?

The matchclass command is designed to match the entire string in the data group. If the string contains two parts seperated by a space as you described, then your matchclass is probably returning false.

Try something like this instead:

[matchclass $::DBConnections starts_with [IP::remote_addr]]

This would say "If any of the elements in the class start with the IP address..." instead of "If the IP address starts with any of the elements in the array...". This is a subtle difference, I know...but a difference nonetheless.

HTH,

-Colin