From the course: MongoDB C# Developer Associate Cert Prep

Troubleshooting a MongoDB connection in C# applications - MongoDB Tutorial

From the course: MongoDB C# Developer Associate Cert Prep

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Troubleshooting a MongoDB connection in C# applications

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- Hello. In this video you'll learn how to troubleshoot common connection errors when using the C# MongoDB Driver, such as network access errors and user authentication errors. Connection errors can cause a lot of frustration for developers. With this video, we hope to minimize that frustration by giving you a foundation to troubleshoot connection problems with MongoDB. Before we begin, it's important to remember that it's common to experience connectivity issues when learning something new like MongoDB. Connectivity issues may stem from systems put into place to protect our database. MongoDB has a lot of resources to help you understand and address these issues. Let's get started by opening a C# console app that already has the MongoDB Driver setup. I'm opening it in Visual Studio '22 on Windows. If you're using a different OS, an IDE, or a text editor, the experience will be slightly different but the code will be the same. Now, this application creates a Mongo client by using a connection string that we retrieved from Atlas. We're creating a client. We are then iterating through the list of databases on the client. So let's go ahead and run this and see what happens. Ah, after a little pause, we have an error message here. Timeout Exception. The message tells us that our connection's timed out. This might occur because our IP address has not been granted network access to the Atlas cluster. By default, the Atlas cluster has no access to the outside world and you need to enable this in the Atlas UI. To confirm this, let's go to the Atlas dashboard for the cluster and click on the network access tab. In the network access tab, you'll notice that no IP addresses haven't added. So let's click on Add IP Address. We can add our current IP address and then click Confirm. We have now saved it, and while that is taking effect, let's switch back to Visual Studio. I'm going to stop and clear that error and we will give it another run now. Ah, this time we get an error much more quickly and it's telling us that we have a Mongo Authentication Exception. That suggests that we have a bad password. Let's take a look. Ah, sure enough, when you copy and paste a connection string from Atlas, it does not automatically put in the password for you. You have to make sure you enter it for security reasons. So there's my password. We'll run again. Ah, and it worked. As you can see, we have three databases from our collection. Awesome job. We didn't cover every type of connection issue in this video, but you now have the tools to identify and troubleshoot two of the most common connection errors. To summarize, here's what you've learned how to troubleshoot in this video. To fix network access errors, use the Atlas UI to add your IP address to the network access tab. To fix an authentication error, ensure that the connection string has the correct password. For security reasons, MongoDB doesn't auto-populate the password field when you copy the connection string from Atlas.

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