issue with cookie persist irule

I'm not sure I see how your iRule would work... However, a couple of things I notice...

1. The cookie is encrypted, yet you use the actual cookie value directly in

    set persist_node [HTTP::cookie "cookie"]

which means the node $persist_node [...] is going to fail too...

shouldn't that be

    set persist_node decrypted

or simply replace 'decrypted' with 'persist_node'...

2. Why are you looping through the poolmembers?

3. What happens if the cookie exists already but wasn't actually set by the iRule HTTP_RESPONSE?

I think you need to catch {} any errors from the decrypting too... Otherwise bad cookies will kill your connection... Are there any other errors (Sorry, I don't have my stuff with me to actually test your iRule on an LTM).

H