Reverse proxy Outbound Rule is not working

Hi,

I have configured Reverse proxy Inbound Rule through Url Rewrite and it working fine. At the same time when I set Reverse Proxy Outbound Rule got "500 - Internal server error." message on same site. If I disable Outbound rule and keep the inbound rule active then its working fine. Once I active outbound rule got "500 - Internal server error." message.

Can anybody help me to resolve the issue.

Thanks

Kaushik