When working with SharePoint, you may come across an error "cannot connect to the configuration database" while browsing your site.
This error may occur for a specific site, multiple sites or even sometimes for all the SharePoint sites including Central Admin.
The error message gives you few important keywords - CONNECTION, CONFIGURATION and DATABASE . So it seems, there is either something wrong with the SQL Database connection or the IIS Configuration.
Here are some possible causes and will help in resolving the issue -
- Check the IIS Site - is it stopped?
- Check the Application Pool - it is stopped?
- Check the Application Pool Identity account - is it correct and password has not expired?
- Check the Application Pool Identity account - is it missing permissions on SQL databases?
- Check the SQL Instance - is any configuration changed recently?
- Check the SQL Instance - the server is up and required SQL services are not stopped?
- Check the SQL Database - the database is not down or offline?
- Check the Firewall settings (less likely) - nothing is blocked?
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