Users not able to download PAC file via LTM

Hi,

 

I am working in a project where F5 GTM -> LTM -> Bluecoat Proxy's are nodes.

 

Traffic Flow - User --> F5 GTM (proxy.gslb.uk.tsb) --> F5 LTM (10.184.16.168) & SNAT (10.184.18.16) --> Bluecoat Proxy (10.184.6.13/14 & 10.185.6.13/14).

 

PAC file hosted into bluecoat proxies itself and proxy PAC URL is () which is configured with user machine.

 

Traffic via GTM/LTM & PAC file :- Nothing is working. Neither Internet is working nor user's are able to download PAC file from there machine.

 

Added a script into Bluecoat Proxy :-

 

ALLOW url.path=/accelerated_pac_base.pac action.ReturnRedirect1(yes)

 

 

define action ReturnRedirect1 request_redirect( 302, ".*", "; )

 

Then after users are able to download the PAC file & internet start working but whole traffic flow behavior got changed as per design. Because after downloading the PAC file, users are directly communicating with proxy and no traffic is balancing via LTM.

 

Without PAC File Scenario :- If we go via without PAC file and communication flow is User -> GTM -> LTM -> Proxy. Everything is working perfectly without any issue and all traffic is balancing via LTM.

 

Customer requirement is to load balance traffic via PAC file but not sure if LTM can fulfill PAC file requirement.

 

Please let me know if anyone face such kind of issue or any proposed solution. It has been very critical and none of SME's are able to solve this.

 

Appreciate for all quick responses and looking SME's thoughts.

 

Thanks