Originally Posted by Briz34
It only leaks when the beer line connector is connected, the poppet is seated fine when I pull it off.
Yes, but if it has a piece of debris stuck in it, or the o-ring is cracked, it would stay sealed anyway until it was depressed. And it's depressed when the connector is pressed on it.
How many times have you cleaned out the post? I do it with every keg, but others don't. If you didn't clean the keg by taking it apart (taking off the posts), it likely has debris in it.