I created page with asyncfileupload inside update panel. It works on IE, FF and Chrome, but in Opera i get JavaScript Server Response Error: 'Unknown Server error' popup every time when i try to upload file with size more then 2-3 hundreds of KB. Help me to find solution, please!
Comments: ok. i found that problem is in windows authentication of web application.
Comments: ok. i found that problem is in windows authentication of web application.