Firefox occurs problems with ext. facing portal

Hello,
Our Java WebAS 7. 0 SPS 15 installation with portal application is located in a DMZ and can be reached over a reverse proxy which maps the port 443 to 50001. With IE and Opera on the client side everything is working fine. But if you use Firefox (2.0 and 3.0 are tested) or Safari (2.1.3 tested), we get problems, if we want to change a whole web page and not only a frame in the page.
If we i.e. log on the portal and change to the portal framework or if we change from the index page of the WAS to the login page from the useradmin, we get only a blank page. But if we edit the page the
completely source code of the page is shown. The page won't be shown until we confirm the URL by clicking enter in the adress bar.
We tested more than one Reverse Proxy and the effect was always the same.
If we run the portal directly without the reverse proxy everthing is working all right even on Firefox and Safari.
Have anybody an idea, what we can try to eliminate this symptom?
Best Regards
Frank

The fixes included in the pathes provided:
Last current version WebDynproRuntime from
SAPJTECHF16P patch level 03
SAPJTECHS16P patch level 03
FireFox browser caches servlet output.archives: SAPJTECHF - WEBDYNPRO.sda
FireFox shows blank page for AmbigiousApplicationWindowIdException.archives: SAPJTECHF - WEBDYNPRO.sda
ClassCastException is thrown for fault parameters Affected archives: WebDynpro.sda - SAPJTECHF.sca
Messages were not getting displayed if application contains a messageArea and when it is split into Iviews.
archives: SAPJTECHF - WEBDYNPRO.sda

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Firefox occurs problems with ext. facing portal

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