iRule - http redirect and x-forward

I guess you are doing some test with uri starting with /test. Does it have links like images referring to uri's other than starting with /test. In that case it will go into the redirect SSL page logic and get into loop.

Also note you are doing SNAT on external LB, so the " X-Forwarded-For" in internal LB won't show actual client IP. May be you didn't show the insertion of X-Forwarded-For in external LB, then it's fine.