ActionScript 3.0 :: URLLoader Generates Error #2048 Depending On File Contents
Jun 7, 2010
I've developed a preloader for an ActionScript 3 application that uses URLLoader to load an encrypted swf. This has been tested on different OSs, Flash Players and browsers and everything works as expected except for a series of PCs being used by a colleague on a corporate network. The PCs at fault use Flash Player 10.0.22.87 with IE6 on WinXP and get security sandbox error #2048 depending on the contents of the file being loaded! Some of the tests and results include:removing 99% of the contents but keeping first 6k (works)replacing contents with 4 bytes 00 (works)inserting 16 bytes: EF BB BF <html></html> at beginning of file (works)inserting 16 0s at the beginning of the file (fails)xor FF all bytes (fails)I've tried other tests such as different file extensions, Security.allowDomain(), crossdomain.xml, Security.loadPolicyFile(), dataFormat = URLLoaderData Format.BINARY etc but I think these are all irrelevant due to the fact that the app sometimes works.The code is just the standard new URLLoader(), adding event listeners, then calling load(new URLRequest()). The test app doesn't include the loadBytes() so this isn't the issue either.
The PC at fault could be behind a firewall or using a proxy. At this stage my only theory is that their antivirus, firewall or proxy is examining the contents and sometimes decides to intervene, perhaps with a redirect. This would also explain why (according to the web server logs) the files are being requested even though the security sandbox error is generated. However, this does not explain why Flash generates the error in the first place, depending on the contents.It's not possible for me to visit on site or get them to modify their settings or configuration, but I can ask them to run various Flash Apps for testing.URL...I can come up with a workaround (such as ensuring the file always starts with dummy <html> tags and then strip them before decrypting), but I'd prefer to get to the bottom of this issue if possible to be confident it won't occur again; this is for a Facebook application so it's possible it will be used in a large variety of environment
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