windows - "Server cannot set status after HTTP headers have been sent" over http but not https -

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i migrated .net web service windows server 2003 windows server 2008 r2. when trying access web service page browser wait server request nothing ever happens. request hangs , never timeout or other status code. when checking httperr logs on server, see request cancelled , has no status code. (see below)

2015-06-02 15:20:49 11.127.2.128 50755 11.113.4.14 56272 http/1.1 /humanresourceservices/1_0_0/help/ - 2 request_cancelled humanresourceservices

i reviewed question httperr log: request_cancelled (while troubleshooting wcf service) , did suggested logging. svc log file generated stays @ 0 byte size , never changes. checked worker processes in iis , gets request site not see request when go "view current request" it. seems request never getting processed, cancelled , server never responds status code. make things more interesting, if access same site on https, works! happening when try access on http. advice or suggestions on ways further troubleshoot appreciated.

update --

i able log working. request being cancelled because application throwing exception. error message "server cannot set status after http headers have been sent." have idea why getting error on http not on https? note, happening on new windows 2008 r2 server. our old server windows server 2003 (iis 6.0) did not have problem.

thanks

looks oversight on part. application pool set integrated when should have been classic. once switched, issue went away.


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