Azure & Office 365

Hi All,

Recently I got below error message which you might have seen. This is a very common and generic error message which can confuse you a lot. You may face this issue in all versions of SharePoint like SharePoint 2007, 2010, 2013 or SharePoint 2016. First let us look at the error message
#################### Error Start #############
Runtime Error Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be view able on remote machines, please create a <customErrors> tag within a “web.config” configuration file located in the root directory of the current web application. This <customErrors> tag should then have its “mode” attribute set to “Off”.

<!– Web.Config Configuration File –>

<configuration>
<system.web>
<customErrors mode=”Off”/>
</system.web>
</configuration>
Notes: The current error page you are seeing can be replaced by a custom error page by modifying the “defaultRedirect” attribute of the application’s <customErrors> configuration tag to point to a custom error page URL.

<!– Web.Config Configuration File –>

<configuration>
<system.web>
<customErrors mode=”RemoteOnly” defaultRedirect=”mycustompage.htm”/>
</system.web>
</configuration>

#################### Error End #############

We can see that error message says something about web.config file. Here is what we need to do.
1. Open IIS management console
2. Start > RUN > Inetmgr > Expand server
3. Expand the site you are getting this error on > right click > explore

Here you should be able to see a web.config file. If this web.config was recently modified by someone, please check with your team if anyone has recently modified this file, tried to deployed a farm\web application solution or run psconfig wizard on any of the SharePoint server in farm.
Note: If you have multiple SharePoint server, try the same on all the servers

In most cases, it is a web.config change done by someone from within the team which cause this issue.
If no one has done any changes:
1. Make a copy of this web.config file and open the original file. Search for “callstack” and set the value to True, again search for customerrors set it to OFF.
2. Rename the recent web.config to web.config.old with today’s date and revert the most recent web.config(date and time) file to web.config
3. Install Examdiff tool on a computer and copy the most recent web.config file and new web.config to identify the changes.

These steps will help you identify the actual cause of this error.

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