MongoDB · January 2, 2024

How to fix MongoDB Error Code - 240 - DNSRecordTypeMismatch

How to Fix MongoDB Error Code - 240 - DNSRecordTypeMismatch

MongoDB is a popular NoSQL database that offers high performance, scalability, and flexibility. However, like any other software, it can encounter errors that may disrupt its normal operation. One such error is the MongoDB Error Code - 240 - DNSRecordTypeMismatch. In this article, we will explore the causes of this error and provide step-by-step instructions on how to fix it.

Understanding the MongoDB Error Code - 240 - DNSRecordTypeMismatch

The MongoDB Error Code - 240 - DNSRecordTypeMismatch occurs when there is a mismatch between the expected DNS record type and the actual record type. This error typically arises when attempting to connect to a MongoDB server using a hostname that has an incorrect DNS record type.

When this error occurs, you may see an error message similar to the following:

Failed to connect to: mongodb://hostname:port, in(checking socket for error after poll), reason: DNSRecordTypeMismatch: Record type doesn't match

Possible Causes of the Error

There are several potential causes for the MongoDB Error Code - 240 - DNSRecordTypeMismatch:

  • Incorrect DNS configuration: The DNS record for the hostname you are using to connect to the MongoDB server may have an incorrect record type.
  • Cache inconsistency: If you recently made changes to the DNS configuration, it is possible that the DNS cache has not been updated, leading to a mismatch between the expected and actual record types.
  • Network issues: Network connectivity problems can also result in this error. Ensure that your network connection is stable and there are no firewall or routing issues.

Fixing the MongoDB Error Code - 240 - DNSRecordTypeMismatch

To resolve the MongoDB Error Code - 240 - DNSRecordTypeMismatch, follow these steps:

Step 1: Verify DNS Configuration

Double-check the DNS configuration for the hostname you are using to connect to the MongoDB server. Ensure that the DNS record type matches the expected type. If you are unsure, consult your DNS provider or system administrator for assistance.

Step 2: Clear DNS Cache

If you recently made changes to the DNS configuration, clear the DNS cache on your system to ensure that the updated records are used. The process for clearing the DNS cache varies depending on your operating system. Here are some common commands:

  • Windows: ipconfig /flushdns
  • MacOS: sudo killall -HUP mDNSResponder
  • Linux: sudo systemctl restart systemd-resolved

Step 3: Check Network Connectivity

Ensure that your network connection is stable and there are no firewall or routing issues. Test the connectivity to the MongoDB server using tools like ping or telnet to verify that you can reach the server without any problems.

Step 4: Restart MongoDB Server

If the above steps do not resolve the issue, try restarting the MongoDB server. This can help clear any temporary issues or cache inconsistencies that may be causing the error.

Summary

The MongoDB Error Code - 240 - DNSRecordTypeMismatch can be resolved by verifying the DNS configuration, clearing the DNS cache, checking network connectivity, and restarting the MongoDB server if necessary. By following these steps, you should be able to fix this error and ensure smooth operation of your MongoDB database.

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