OWA with BE/FE - Help!!!

I have a BE server and a FE server. There is a firewall Between them. When
I access the OWA from BE directly, my mailbox load properly. When I access
the OWA from FE, the OWA identifies my user, but shows a message "loading"
and stop. I followed every steps from Microsoft´s white papers. I put a
rule on the firewall, FE is allowed any packet to internal network. The
Firewall-1´s log doesn´t show any drop.


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