Cache file in use by another service

[Mark]

Hi, 

We are getting the below error when trying to view any telerik report on our hosted webpages. 
Error registering the viewer with the service.

An error has occurred.
The process cannot access the file '\\sfs-iisfile\IIS Content\sfs.portal.webapp\reports-cache\509e4f1d\11.2.17.913\LCT\value.dat' because it is being used by another process.

We have a load Balanced environment and this error seems to happen sporadically, it happened a few months ago and seemed to correct itself but has now happened again.

Has anyone else experienced this issue and could help with possible fixes or suggestions?

Thanks in Advance,
Adam

[Silviya]

Hello Adam,

The error message might occur if there are multiple instances of the server running and the viewer which is used in the server for displaying reports is trying to access the cache storage. 
Check machine's Event Viewer - we will need the details of the error and the logged stack trace.  

I noticed that the environment is load balanced, so in this case, it is a must to switch to MsSqlServerStorage or RedisStorage - IStorage implementation suitable for deploying in Web Farms.

In case of further questions, please open new support ticket and provide us with the event viewer log in order to investigate locally.

Regards,
Silviya
Progress Telerik