There was one JavaScript error which is killing every ones time.
Some time when we access a SSRS Drill thru in some scenario we go the following error.
When we debug in IE it given long list of complaints.
| SCRIPT5022: Sys.WebForms.PageRequestManagerServerErrorException: An unexpected error has occurred. HTML1202: http://server/sites/site/ is running in Compatibility View because 'Display intranet sites in Compatibility View' is checked. SEC7115: :visited and :link styles can only differ by color. Some styles were not applied to :visited. SCRIPT5022: Sys.WebForms.PageRequestManagerServerErrorException: An unexpected error has occurred. SCRIPT5022: Sys.WebForms.PageRequestManagerServerErrorException: An unexpected error has occurred. SCRIPT5022: Sys.WebForms.PageRequestManagerServerErrorException: An unexpected error has occurred. |
As it is a JavaScript error, every one started looking into client configurations and then Web.Config.
We found many solutions they all worked in first go, as the error was intermittent after every setting change we believed the issue is fixed. But the truth is the Error smiled to us once in a while!!
- Turn off HTTP 1.1 in browser
- Turn off Async Rendering in Report Viewer Web part
- Recreate the page
- aspnet:MaxHttpCollectionKeys
- scriptResourceHandler enableCompression="false" enableCaching="true"
then what!!
Start from the beginning. We started analyzing the all the logs, SharePoint, SSRS, IIS. Try reproducing the error and get point in time error log. The point in time error study helped.
We got the following error message in SharePoint log
| Message |
| Unexpected error occurred in method 'GetObject' , usage 'SPViewStateCache' - Exception 'Microsoft.ApplicationServer.Caching.DataCacheException: ErrorCode<ERRCA0018>:SubStatus<ES0001>:The request timed out.. Additional Information : The client was trying to communicate with the server : net.tcp:/DEVSRV2.com:22233 at Microsoft.ApplicationServer.Caching.DataCache.ThrowException(ResponseBody respBody, RequestBody reqBody) at Microsoft.ApplicationServer.Caching.DataCache.InternalGet(String key, DataCacheItemVersion& version, String region, IMonitoringListener listener) at Microsoft.ApplicationServer.Caching.DataCache.<>c__DisplayClass49.<Get>b__48() at Microsoft.SharePoint.DistributedCaching.SPDistributedCache.GetObject(String key)'. |
| Unable to write SPDistributedCache call usage entry. |
| ViewStateLog: Failed to read from the velocity cache: http://ServerName/sites/ProjName/Pages/ReportName.aspx |
So the culprit is Distributed Cache
- Distributed Cache is the new service in SharePoint 2013
- For View State, DistributedViewStateCache is used.
- As the View State is not available while loading the page, we are getting the Java Script Error.
Lessons
- Understand the problem first before jumping to solutions, try to get some pattern. All Bing answers are not for you!!
- Get as many logs as possible. especially the point in time log. Get the log backup.
- Widen the scope and thing broader for the intermittent issues.
Happy coding & debugging!!
