We are using IIS Proxy 1.6 for accessing a custom J2EE application deployed on J2EE engine and for accessing the portal.
We have got a custom loginmodule code which determines access to the applications mentioned above.
This loginmodule redirects to an error web page hosted on IIS under some erroneous condition. Earlier we were using SP9 and the loginmodule code was able to redirect to the error page.
After moving to SP15 we find that under erroneous condition the redirction does not oocur and the browser simply hangs. We dont see any logs updation in the IIS proxy logs during the hanged state.
Has anybody faced similar problems while working with IIS 5 proxy and SP15?
I have a strong suspicion, that most of HttpSetterCallback method do not work in SP15. It would be the answer for your problem - module does not write what you expect to HTTP stream. You might try tool like HTTP Watch to see what portal produces in fact.
In SP2 we used WebCallback, directly accessing HTTP response, but in SP15 it did not work after slight API adaptations, I am afraid. We rewrote the whole module, but without success. Simple demo module written for this case has showed, that there is something writh in HttpSetterCallback. We will continue in explorations, as the problem is vital for us.