MongoDB · January 2, 2024

How to fix MongoDB Error Code - 174 - TransportSessionUnknown

How to Fix MongoDB Error Code - 174 - TransportSessionUnknown

MongoDB is a popular open-source NoSQL database that offers high performance, scalability, and flexibility. However, like any software, it can encounter errors that may disrupt its normal operation. One such error is MongoDB Error Code - 174 - TransportSessionUnknown. In this article, we will explore the causes of this error and provide step-by-step solutions to fix it.

Understanding MongoDB Error Code - 174 - TransportSessionUnknown

MongoDB Error Code - 174 - TransportSessionUnknown occurs when a client attempts to use a session that does not exist or has expired. Sessions in MongoDB are used to group operations together and provide transaction-like behavior. When a session is not found or has expired, MongoDB throws this error.

Possible Causes of MongoDB Error Code - 174 - TransportSessionUnknown

There are several reasons why you might encounter this error:

  • Expired Session: If a session has been inactive for a certain period, it expires. Attempting to use an expired session will result in the TransportSessionUnknown error.
  • Invalid Session ID: If you provide an incorrect or non-existent session ID, MongoDB will not be able to find the session and throw the error.
  • Network Issues: Network interruptions or connectivity problems between the client and the MongoDB server can also trigger this error.

Fixing MongoDB Error Code - 174 - TransportSessionUnknown

To resolve the TransportSessionUnknown error, follow these steps:

1. Check Session Expiry

Verify if the session you are trying to use has expired. If it has, you need to create a new session and use the new session ID for your operations.

// Create a new session
const session = db.getMongo().startSession();

// Use the new session ID for your operations
db.collection.find().session(session);

2. Verify Session ID

Double-check the session ID you are using. Ensure that it is correct and exists in the MongoDB server. If it is incorrect or non-existent, you need to obtain a valid session ID and use it for your operations.

// Obtain a valid session ID
const session = db.getMongo().startSession();

// Use the valid session ID for your operations
db.collection.find().session(session);

3. Check Network Connectivity

Ensure that there are no network issues or connectivity problems between the client and the MongoDB server. Check your network configuration, firewall settings, and any other factors that may affect the connection. If necessary, consult with your network administrator or hosting provider to resolve any network-related issues.

Summary

In conclusion, MongoDB Error Code - 174 - TransportSessionUnknown occurs when a client attempts to use an expired or non-existent session. To fix this error, you need to create a new session if the existing one has expired, verify the session ID for correctness, and ensure there are no network connectivity issues. By following these steps, you can resolve the TransportSessionUnknown error and continue using MongoDB seamlessly.

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