Troubleshoot timeout errors while connecting with Azure Managed redis

Question

Hi team,

I am trying to connect to an Azure Managed Redis from my local machine but it is giving me timeout errors.

Could not connect to Redis at (Endpoint)

Also, can someone guide me on below points:

1. Connect Azure Managed Redis using private endpoints configured to it.
2. Generating test data inside Azure Managed Redis so that I can capture its Diagnostic Settings - Auditing logs.

Answer 1

Hi ,

Thanks for reaching out to Microsoft Q&A.

Troubleshooting timeout errors

1. Check network access: azure managed Redis (premium/enterprise tiers) blocks public access by default when private endpoints are enabled. Verify that your local machine is connected to the same VNet via VPN or ExpressRoute.

DNS resolution: Ensure your local system resolves the Redis private endpoint to the private IP (use nslookup <redis-name>.privatelink.redis.cache.windows.net).

Firewall and NSG rules: Confirm that port 6380 (TLS) is open between your machine and the Redis private endpoint.

Client config: Use ssl=True and the correct access key in your Redis client.

Connecting via Private Endpoint

Private endpoints are only accessible from within the linked VNet or peered VNets. To connect locally, use Azure Bastion, Jumpbox VM, or VPN into the same VNet.

Generating test data for diagnostics:

Use the Azure Portal or redis-cli to insert sample data-->

redis-cli -h <redis-endpoint> -a <access-key> --tls
set testkey "testvalue"

• Once data is written, enable Diagnostic Settings -> Send to Log Analytics/Storage/Event Hub to capture and inspect auditing logs.

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Answer 2

Hi Swarada Jalukar •

Greetings!!

In addition to Vinodh247,

it sounds like you're running into some timeout errors while trying to connect to your Azure Managed Redis from your local machine. Here are some steps you can take to troubleshoot the issue:

Troubleshooting Timeouts:

1. Check TLS Version: Make sure that your local machine is using TLS 1.2 for the connection, as Azure Cache for Redis will enforce it starting from April 2025. You can check and update your client to use TLS 1.2 following the instructions here.
2. Review the Server Load: High server load can cause timeouts. Check the Server Load metric in the Azure portal under the Monitoring section. If it’s high, consider reviewing your workload and optimizing your requests.
3. Memory Usage: Check for high memory usage on the Redis server. If the server is under memory pressure, it can significantly affect performance. Here's a guide on High Memory Usage.
4. Inspect Long Running Commands: Long-running commands can also lead to timeouts. You may want to assess the commands being executed for their time complexity. More details can be found in the section on Long Running Commands.
5. Network Bandwidth: Ensure that neither your server nor your local machine is exceeding its network bandwidth capacity, as this can lead to timeouts. Learn how to monitor this here.

Private Endpoint Connections:

To connect to Azure Managed Redis using private endpoints configured to it, make sure that:

Your local network is properly set up to communicate with the private endpoint.

You may need to adjust your DNS settings to resolve the private endpoint.

Generating Test Data and Diagnostic Settings:

To generate test data inside Azure Managed Redis and capture its diagnostic settings, including auditing logs:

• Use Redis commands to insert test data. You might use commands like SET to insert data.
• Ensure that diagnostic settings are correctly configured to capture logs. For details on setting this up, check Monitoring Azure Cache for Redis for more insights.it sounds like you're running into some timeout errors while trying to connect to your Azure Managed Redis from your local machine.

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

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