IIS 7 and Above
Application Request Routing (ARR)
Application Request Routing
Re: Application Request Routing
Oct 04, 2018 05:55 AM|Terry Peng|LINK
Usually, once we got the 403-Forbidden error, it is related to permission issue. I would suggest you check if the account you used for HealthPlaNETAdminServices-Token-CI has enough permission on EnterpriseLookupValueManagement folder.
I would also suggest you visit the target site directly in case of any effects from the rewrite rule.
If you do not have problem to visit the target site directly, I think the issue should be related to you rewrite rule. Please share us your rewrite rule.
If you have problem to visit the site, I think the issue is still related to the permission issue. As Lex said, check the sub statue code for further information.