Hi,

2 days ago my dnn site went down.The following was the error message.

Server Error in '/' Application.

A read lock may not be acquired with the write lock held in this mode.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Threading.
LockRecursionException: A read lock may not be acquired with the write lock held in this mode.

Source Error:



An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.


Stack Trace:




[LockRecursionException: A read lock may not be acquired with the write lock held in this mode.]
System.Threading.ReaderWriterLockSlim.TryEnterReadLock(Int32 millisecondsTimeout) +415170
System.Threading.ReaderWriterLockSlim.EnterReadLock() +7
DotNetNuke.Collections.ReaderWriterLockStrategy.GetReadLock() +25
DotNetNuke.Collections.SharedDictionary`2.GetReadLock() +24
DotNetNuke.Common.Utilities.DataCache.GetCachedDataFromDictionary(CacheItemArgs cacheItemArgs, CacheItemExpiredCallback cacheItemExpired) +59
DotNetNuke.Common.Utilities.DataCache.GetCachedData(CacheItemArgs cacheItemArgs, CacheItemExpiredCallback cacheItemExpired, Boolean storeInDictionary) +16
DotNetNuke.Entities.Portals.PortalAliasController.GetPortalAliasLookup() +106
DotNetNuke.Entities.Portals.PortalAliasController.GetPortalAliasInfo(String PortalAlias) +16
DotNetNuke.HttpModules.UrlRewriteModule.RewriteUrl(HttpApplication app) +2561
DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +1033
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +68
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

Version Information: Microsoft .NET Framework Version:2.0.50727.3623; ASP.NET Version:2.0.50727.3618

can anyone help me for this?

Did this happen "out of the blue" or after some changes to the site?

The errors appear to be related to page caching. If you can get access to the file system on your site, deleting everything in the cache directory (Portalx/N/Cache) may help.

You might also verify that the file permissions are set correctly on your site.