OWA via web publishing server(isa server)

Dear;
how can we access Outlook Web Access via web publish server (in ISA Server).
i've already tried to set and put OWA server location in web publishing rules, 
but when i tried to browse it with IE url: (external_ip_isa_server/exchange) 
via dial up connection, there's blank page, but there's page when i only put 
external_ip_isa....

i think that it should be done, but it did't work.....i guess that asp script 
in the OWA can be problem....

i'm waiting for all your comments and ideas about this....

Thank you.. 
 A M O S

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