Reporting Services and SharePoint - Context Expired Exception

Problem
At one of our client locations, developers and users complained of issues in accessing reports within SharePoint. The error was not occurring consistently. We quickly decided that since it wasn't happening every time, it may be a web-front-end (WFE) issue (as there are three WFEs load-balanced together) . After thinking about this, we narrowed it down to one of the WFEs.

When trying to open a report or even looking at a data source, SharePoint would throw an exception: "Report Server has encountered a SharePoint error. ---> Microsoft.SharePoint.SPException: The context has expired and can no longer be used. (Exception from HRESULT: 0x80090317) " . The full error message is at the bottom of this post.

Solution
I tried the usual remedy steps such as IISRESET and rebooting the server. I then tried to repair the RS Add-In and even run the SharePoint Configuration Wizard. Nothing was working but I did notice in the logs that the timestamps were not the right time.

After several other (almost) drastic actions, I decided to fix the clock on the server to have the correct time. Voila! This resolved the context issue and everything started working. The clock was so much different than any client machine that the security context was assumed to be expired.

Sometimes a simple thing can cause major problems and sometimes major problems can be fixed by a simple solution.

Full Error Message
System.Web.Services.Protocols.SoapException: Report Server has encountered a SharePoint error. ---> Microsoft.ReportingServices.Diagnostics.Utilities.SharePointException: Report Server has encountered a SharePoint error. ---> Microsoft.SharePoint.SPException: The context has expired and can no longer be used. (Exception from HRESULT: 0x80090317) ---> System.Runtime.InteropServices.COMException: The context has expired and can no longer be used. (Exception from HRESULT: 0x80090317) --- End of inner exception stack trace --- at Microsoft.ReportingServices.WebServer.ReportingService2005Impl.GetDataSourceContents(String DataSource, DataSourceDefinition& Definition) at Microsoft.ReportingServices.WebServer.ReportingService2006.GetDataSourceContents(String DataSource, DataSourceDefinition& Definition)