Firefox Silverlight WSOD

[Rob Lange]

Totally stuck… Our website loads just fine in Firefox when not using WebAii. However, when I load it with WebAii, I get the white screen of death. I can load other web pages with Silverlight using WebAii. There are no errors in the Firefox Error Console. I notice that WebAii thinks the page is done loading while IIS is still sending the XAP to the browser. However, even if I sit there in debug mode, it never loads the Silverlight control (even after IIS finishes). Maybe there is some kind of timeout? We load our Silverlight control inside of an IFRAME. Totally stuck, any ideas are welcome.

[Rob Lange]

I put a hello world in place of our XAP. Still broken. So, probably not a timeout issue.

[Cody]

Hello Rob Lange,

Two thoughts:

1. Did you Enable Silverlight in your WebAii test as in this documentation?
2. Is the MIME Type for .XAP files properly configured as in this blog post?

Greetings,
Cody
the Telerik team

[Rob Lange]

Thanks for the ideas. Silverlight is correctly enabled, and the IIS server is also setup correctly. The problem is very specific to our page, using WebAii and Firefox. Change one of those elements, and it works just fine. I'm not looking forward to telling my boss that our automation doesn't work on Firefox anymore :(

[Cody]

Hi Rob Lange,

Any chance I can access this Silverlight application directly to study the problem?

All the best,
Cody
the Telerik team

[Rob Lange]

I'm going to keep this thread up to date, in case we solve the problem and other people run into the issue.

I've tracked the problem down to a proxy issue. If I turn off Silverlight, which turns the proxy off, the Silverlight application loads just fine. I'd say it was some kind of firewall issue, but if it was then why would only the Silverlight part of the page fail to load?

[Rob Lange]

I've also confirmed the problem repros when using localhost and remote machine IIS servers.

I turned EnableSilverlight off and UseHttpProxy on. It still failed to load the Silverlight app in Firefox, however it loaded the app in IE. Proving it's not a firewall issue.

I noticed you guys have VerboseHttpProxy. How do I access the verbose data? It might tell us why this is failing.

[Cody]

Hello Rob Lange,

Interesting follow up. This does sound like our HTTP Proxy is doing something wrong. Unfortunately there's no way for us to remotely diagnose this problem. We need direct access to the application so we can debug it in our development environment.

You can try using Visual Studio to attached to the "ArtOfTest.HttpProxy.exe" process to get the verbose output in its debugger window.

Best wishes,
Cody
the Telerik team