asp.net - .NET Pages Hang in Internet Explorer -


we have odd major issue internal web application. written in asp.net 4.0 , has been working fine while. few days ago stopped working in ie10,9 , 8. on pages when clicking button page hangs hour. not happen in opera, chrome or firefox, happen in current versions of ie. of pcs have not been rebooted months not think due update ie. if deploy application different server works fine ie too..... not happen when running site development environment. have discovered happens when site running on either live server or test server (both identical not quite) , happens when accessing site ie!

the live , test servers both win 2008 while server work on win 2003 , dev environment on windows 7.

anyone have ideas might going on or start looking?

edit--------------------------------------------------

we have discovered root of problem, although not why causing issue. have buttons clientsideonclick event added manually. seems cause 2 postback methods added button (one manual , 1 automatic). if not add manual event works fine. turn off autoeventwireup our page_load events etc not wired (and there lot of pages in app fix if that). can disable autoeventwireup buttons?

we have discovered cause of issue combination of 2 things.

firstly .net 4.5 installed on servers (it installed on test server time ago, nature of issue means seems not ever hit on test server in time).

then discovered (as posted above) there instances buttons given 2 javascript postback events.

these buttons have not been altered @ least 3 years , have been working fine (even if not best practice or wanted behavior), installing 4.5 framework on server seems have made these break in ie (yep, microsofts update breaks pages in microsofts own browser...). . means can pages working again. still not know why installing .net framework 4.5 on server broke code running in framework 4.0 has been working fine @ least 3 years (possibly many more that). more baffling why broke in internet explorer.


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