Hi, I have a two servers farm (app and web). After weekend Sharepoint stops working. App server aplication log looks like this: Web server application log looks like: Thanks in advance. M.

Hi, Try rebooting these servers one by one and check if it works. I hope this will help you out.Thanks, Rahul Rashu

Yes, that works... but I'm trying to find out the root of the problem, because it happens every weekend (I think regarding any schedulled task or something similar) Thanks, Martín

Yes, that works... but I'm trying to find out the root of the problem, because it happens every weekend (I think regarding any schedulled task or something similar) Thanks, Martín I found the following exception within the logs. "System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.SharePoint.Linq.FieldRef.GetHashCode() at Microsoft.SharePoint.Linq.FieldRef.FieldRefEqualityComparer.GetHashCode(FieldRef obj) at System.Linq.Set`1.InternalGetHashCode(TElement value)..." It seems to be a known issue using Linq... but it also seems there are no answers! I'll appreciate any help. Thanks.