Greetings.
Environment: Win2008R2 Enterprise/IIS7.5/asp.net web forms/.net 4.5
Recently, we have experienced 3-5% of our clients "hanging" in our web application. The page freezes up on the user with IE spinning and never resolving. The user has to restart the browser session to recover. We've seen this with IE7/8/9.
In viewing the httperr log, we see this:
2012-12-17 03:09:40 24.118.6.64 52594 10.0.2.3 80 HTTP/1.1 POST /Assessments/Assessment.aspx?id=E704EBC5-23BB-4DFF-9A28-706195253086 - 8 Connection_Dropped PharmAcademic
This code is not new and had been functioning well for a couple of years. The changes we made were:
1. Upgrading the .net framework from 4 to 4.5
2. We changed the header of the master page from:
<!DOCTYPEhtmlPUBLIC"-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
to
<!DOCTYPEhtml>
3. We removed the X-UA-Compatible IE=7 from the website
We're really scratching our heads on this one. We don't want to go back to IE7 mode due to some other issues. Any ideas out these how to approach this issue?
