IP to DNS reverse lookup + Geo location? Delimitted format?

Hi everyone, i've strayed away from this post for a while, but am trying to resurrect the above irule. However, i get a "no data received" error when i apply the irule to my existing site, for which i have a default pool selected. Any ideas on what i'd need to modify to make this work, or what i'm doing wrong? I just want to log one ip per user, per session, and then am planning on trying Hoolio's idea for Maxmind reverse dns and geo.

 

 

There's probably a simple answer here, i'm just not sure what that is....