IBM Merge/Pacs thru F5

We frontend the IBM MergePACS thru and F5 and it causes a double login. Going direct to server, the double login does not happen. IBM says the cookie the MergePACS system is setting is getting stripped off by the F5, and thus the double login.

I've tried a bunch of settings and nothing has worked. I've made an iRule to persist the cookie ID across request and response , but it still happens.

Made the http profile as generic as possible, advanced settings, nothing has worked.

Anyone run into this?

Thx