SSRS 2012, Sys.WebForms.PageRequestManagerServerErrorException with status code returned from the server was: 12029.


i executing huge report has 8 subreports in ssrs 2012, out of 15 times of execution error once. time report doesn't renders , there error icon @ left bottom of web page. when click open see details, gives following error;

sys.webforms.pagerequestmanagerservererrorexception: unknown error occurred while 
processing request on server. status code returned server was: 12029.

on appreciated.

best regards,
vijay venkata 

hi vijay,

based on research, issue can caused network connection between client , server dropping. can use microsoft network monitor to monitor network connection. can use fiddler monitor local request , received response message. see: troubleshooting reporting services @ client tier fiddler.

reference:
ssrs 2008 error - sys.webforms.pagerequestmanagerservererrorexception: status code 12029
ssrs – webforms error 12019

if have question, please feel free ask.

best regards,
qiuyun yu


qiuyun yu
technet community support




SQL Server  >  SQL Server Reporting Services, Power View



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