The following table describes all messages and errors that could be reported by 51Degrees Detector for .NET in the log file. By default, errors are reported in App_Data/log.txt, but this can be changed in the log section . If the steps here do not fix the problem, or the error is not covered, please search our forums , post a request there, or  Contact Us .

General Operation Messages
Message	Level	Cause	Solution
Initialising redirection module.	Debug	The Redirection module is about to be started.	N/A
Initialising redirection module static fields.	Debug	Static fields in the Redirection module are about to be initialised.	N/A
Disposing redirection module.	Debug	The Redirection module is about to be disposed.	N/A
Disposing detector module	Debug	The Detector module is about to be disposed.	N/A
Trimmed request history file ' file path ' by removing bytes removed bytes.	Debug	The Devices.dat file has been reduced in size, as some stored requests are no longer relevant.	N/A
Could not open request history file ' file name ' in mode ' mode ', with access ' access ' and share ' share '.	Debug	The Devices.dat file could not be modified. Check the app pool has modify permissions for the file.	N/A
Redirection module could not automatically be registered. Redirection services will not be available unless the HttpModule is included explicitly in the web.config file or Microsoft.Web.Infrastructure is installed.	Warn	The Redirection module was not registered automatically.	The 51Degrees Detector must be explicitly added in the web.config.
Data Reader Messages
Message	Level	Cause	Solution
Creating provider from binary data file ' file path '.	Info	The Detector is about to create a provider from binary data.	N/A
Created provider from binary data file ' file path '.	Info	The Detector has completed creating the provider from binary data.	N/A
Creating provider from XML data files ' file paths '.	Info	The Detector has completed creating the provider from xml data.	N/A
Created provider from XML data files ' file paths '.	Info	The Detector is about to create a provider from xml data.	N/A
Adding to existing provider from XML data files ' file paths '.	Info	The Detector is about add additional data to the provider from xml patch files.	N/A
Added to existing provider from XML data files ' file paths '.	Info	The Detector has finished adding additional data to the provider from xml patch files.	N/A
Added to existing provider from XML data files ' file paths '.	Info	The Detector has finished adding additional data to the provider from xml patch files.	N/A
The data provided is not supported by this version of Foundation. The version provided is ' version ' and the version expected is ' version '.	Fatal	The data provided is not supported by the Foundation.	Get the latest Foundation and data.
Creating provider from embedded device data ' resource name '.	Debug	Embedded data is about to be loaded. If you were expecting external data to be loaded check for another log stating why it has not.	N/A
Created provider from embedded device data ' resource name '.	Debug	Embedded data has finished loading.	N/A
Exception processing device data from binary file ' file path ', and XML files ' file paths '. Enable debug level logging and try again to help identify cause.	Fatal	An error occurred reading data files. The message should yield more information.	Follow the extra information. Try removing patch files, if any to isolate the problem. Contact Us if this error persists.
Auto Update Messages
Message	Level	Cause	Solution
Automatically updated binary data file ' file name ' with version published on the ' date '.	Info	Device data has successfully updated.	N/A
Activated binary data file ' file name ' with new version dated the ' data published date '.	Info	New data has been loaded.	N/A
Exception auto update download binary data file ' file name '.	Warn	There was an error getting new device data. The message should carry more information which should correspond with another issue in this table.	Follow advice from the additional information, and then Contact Us if the error persists.
MD5 hash ' hash ' validation failure with data downloaded from update URL ' 51Degrees.com url '.	Warn	Occurs when the file expected was different than the one downloaded, or the licence key is not valid.	Check the correct licence key is installed and that there are no proxies that could be manipulating the response. If the problem persists, contact us.
Exception validating data array	Warn	New device data has been downloaded and passed validation but cannot be used as it is missing data.	Contact Us .
Auto local file check thread aborted	Warn	The local file check thread stopped running. This may be because the server ran out of memory or the thread was somehow interrupted. The error message should show more detailed information.	Information from the message should help diagnosing the problem. If that doesn't help, contact us.
Auto update download thread aborted	Warn	The auto update thread stopped running. This may be because the server ran out of memory or the thread was somehow interrupted. The error message should show more detailed information.	Information from the message should help diagnosing the problem. If that doesn't help, contact us.
Examining disk for newer data file.	Debug	Logs whenever the detector looks on disk for a new data file. This is useful for when a data is manually updated, or environments with multiple worker processes, as another process may have already downloaded new data.	N/A
Share Usage Messages
Message	Level	Cause	Solution
Stopping usage sharing as remote name ' 51Degrees.com url ' timeout count exceeded ' timeout limit '.	Debug	Share usage has failed many times. This can happen for a variety of reasons, such as a firewall blocking web requests, or slow network connections.	N/A
Stopping usage sharing as remote name ' 51Degrees.com url ' returned status description ' status '.	Debug	This can happen if the share usage service is experiencing difficulty usually related to a large number of requests.	N/A
Stopping usage sharing as insufficient permission to send device information to ' 51Degrees.com url '.	Debug	This happens when the identity of the application or if running on IIS the application does not have permission to make HTTP requests to send device information.	N/A
Stopping usage sharing as remote name ' 51Degrees.com url ' could not be resolved.'.	Debug	The share usage endpoint could not be resolved.	This is likely to be due incorrect DNS settings on the web server.