Sitefinity with reverse proxy

Hi:

our website is Sitefinity + IIS + apache reserve proxy.

Sitefinity，IIS， Apache reverse proxy 3 components in the same server.

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IIS is listening on port 8080 and url is http://test.com:8080

Reverse proxy is listening on 80, url is http://test.com

We found most of pages on url http://test.com/Sitefinity/xxx are working from outside.

but only on module  builder.

if we click one module on test.com/.../ it will show timeout and the url in browser.

will be redirected to  test.com:8080/.../.

is there any settings on Sitefinity can resolve this problem?