Intermittent Connection Issues with Azure MySQL Flexible Server (Error P1001 and Lost Connection During Query)

Question

Description:

I’m experiencing intermittent connection issues with an Azure Database for MySQL Flexible Server. At times, I’m able to connect, but the connection is frequently lost, especially when trying to fetch schema or run queries. Below are the details of the errors I'm encountering:

Error Messages:

1. Error P1001: Can't reach database server at iot-platform.mysql.database.azure.com:3306. Please make sure your database server is running at this address.
2. Lost connection to MySQL server during query: This error occurs when fetching schema data from the database or running a query.

Steps Taken:

• Verified that the MySQL server is up and running in the Azure portal.
• Confirmed that the connection string is correct and that port 3306 is open.
• Tried restarting the server to resolve the issue, but the problem persists.

Additional Info:

• Using MySQL Workbench and Node.js to connect to the Azure MySQL instance.
• The issue seems to occur more frequently during schema retrieval and heavier queries.
• Server is configured to allow connections from Azure services.

Question:

Has anyone encountered similar intermittent connectivity issues with Azure MySQL Flexible Server? Any suggestions on how to further troubleshoot this or settings I might have missed?

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Answer 1

Hi @Varun Jayarama,

Welcome to the Microsoft Q&A and thank you for posting your questions here.

Based on the error messages you provided, it seems that you are experiencing transient connectivity issues with your Azure Database for MySQL Flexible Server.

Error P1001: Can't reach database server at iot-platform.mysql.database.azure.com:3306. Please make sure your database server is running at this address.

1. Double-check that your MySQL server is running and accessible.Double-check that your MySQL server is running and accessible.
2. Ensure that your firewall rules allow traffic from your client IP address. Temporarily allow all IP addresses (0.0.0.0 to 255.255.255.255) to see if this resolves the issue, then narrow it down to specific IP ranges.
3. If your server is configured for private access, ensure your client is within the same virtual network.
4. Ensure that DNS resolution is working correctly for your server’s hostname.
5. Make sure your connection string is correct and includes the necessary parameters, such as connect_timeout=300.

Lost connection to MySQL server during query: This error occurs when fetching schema data from the database or running a query.

1. Ensure your server is not hitting resource limits, such as maximum connections.
2. Optimize your queries or break them into smaller parts to reduce load on the server.
3. If using connection pooling, try clearing the connection pool when you encounter connection issues.
4. Review server logs for any errors or warnings that might provide more insight into the connection issues. This can be done through the Azure portal.

I would request you to refer the below mentioned links for more information.

https://www.prisma.io/docs/orm/overview/databases/mysql#arguments

https://learn.microsoft.com/en-us/azure/mysql/flexible-server/how-to-troubleshoot-common-connection-issues?source=recommendations#troubleshoot-common-errors

https://github.com/prisma/prisma/discussions/21666

https://techcommunity.microsoft.com/t5/azure-database-for-mysql-blog/handling-failover-events-for-azure-database-for-mysql-flexible/ba-p/2685702

Hope this helps. Do let us know if you any further queries.

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