Call Us! 1-800-383-5193
Call Us! 1-800-383-5193
Call Us! 1-800-383-5193

Need Help?

Emergency Response Time custom

Our experts have had an average response time of 11.06 minutes in March 2021 to fix urgent issues.

We will keep your servers stable, secure and fast at all times for one fixed price.

Troubleshoot Azure Cache for Redis timeouts

by | Feb 26, 2021

Wondering how to troubleshoot Azure Cache for Redis timeouts? We can help you with it.

Azure Cache for Redis provides an in-memory data store based on the Redis. Moreover, Redis improves application performance by supporting common application architecture patterns. However, timeouts can occur here due to various reasons that include requests being bound by bandwidth limitations, commands taking a long time to process on the server, and so on.

Here at Bobcares, we have seen several such Azure-related queries as part of our Server Management Services for web hosts and online service providers.

Today, we’ll take a look at how our Support Engineers troubleshoot for Redis timeouts.


How to troubleshoot Azure Cache for Redis timeouts

Now let’s take a look at how our Support Engineers troubleshoot the Redis timeout issues.


Redis server patching for timeouts issue

Azure Cache for Redis regularly updates its server software as part of the managed service functionality.

This patching activity takes place behind the scene. Sometimes, if there is any failover and during the patching of Redis server nodes are, Redis clients who connect to these nodes may experience temporary timeouts as connections are switched between these nodes.


StackExchange.Redis timeout exceptions for Azure Cache

StackExchange.Redis uses a configuration setting named synctimeout. It mainly uses it for synchronous operations with a default value of 5000 ms.

In case, if the synchronous call doesn’t complete at this time, the StackExchange.Redis client throws a timeout error similar to the following example:

System.TimeoutException: Timeout performing MGET 2728cc84-58ae-406b-8ec8-3f962419f641, inst: 1,mgr: Inactive, queue: 73, qu=6, qs=67, qc=0, wr=1/1, in=0/0 IOCP: (Busy=6, Free=999, Min=2,Max=1000), WORKER (Busy=7,Free=8184,Min=2,Max=8191)

This error message contains metrics that can help point you to the cause and possible resolution of the issue. The below table contains details about the error message metrics.


Here are the steps we follow to investigate possible root causes.

1. As a best practice, we make sure that the customer is using the following pattern to connect when using the StackExchange.Redis client.

private static Lazy<ConnectionMultiplexer> lazyConnection = new Lazy<ConnectionMultiplexer>(() =>
return ConnectionMultiplexer.Connect(",abortConnect=false,ssl=true,password=...");


public static ConnectionMultiplexer Connection
return lazyConnection.Value;

2. Ensure that the server and the client application are in the same region in Azure.

3. We make sure to use the latest version of the StackExchange.Redis NuGet package.

4. If the requests are bound by bandwidth limitations on the server or client, it takes longer for them to complete and can cause timeouts. We see if the timeout is because of network bandwidth on the server, or because of client network bandwidth and take respective action.

5. We check if we are getting CPU bound on the server or on the client. High CPU causes the request not to process within the synctimeout interval and causes a request to time out.
Also, we check if we are getting CPU bound on the server by monitoring the CPU cache performance metric.

6. Long-running commands that are taking a long time to process on the Redis-server can cause timeouts. So we make use of SLOWLOG commands.

7. Timeouts can also occur due to the High Redis server load. We monitor the server load by monitoring the Redis Server Load cache performance metric.


[Need any further assistance with Azure queries? – We are here to help you.]



Today, we saw how our Support Engineers troubleshoot Azure Cache for Redis timeouts.


Never again lose customers to poor server speed! Let us help you.

Our server experts will monitor & maintain your server 24/7 so that it remains lightning fast and secure.


var google_conversion_label = "owonCMyG5nEQ0aD71QM";


Submit a Comment

Your email address will not be published. Required fields are marked *

Privacy Preference Center


Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.

PHPSESSID - Preserves user session state across page requests.

gdpr[consent_types] - Used to store user consents.

gdpr[allowed_cookies] - Used to store user allowed cookies.

PHPSESSID, gdpr[consent_types], gdpr[allowed_cookies]


Statistic cookies help website owners to understand how visitors interact with websites by collecting and reporting information anonymously.

_ga - Preserves user session state across page requests.

_gat - Used by Google Analytics to throttle request rate

_gid - Registers a unique ID that is used to generate statistical data on how you use the website.

smartlookCookie - Used to collect user device and location information of the site visitors to improve the websites User Experience.

_ga, _gat, _gid
_ga, _gat, _gid


Marketing cookies are used to track visitors across websites. The intention is to display ads that are relevant and engaging for the individual user and thereby more valuable for publishers and third party advertisers.

IDE - Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.

test_cookie - Used to check if the user's browser supports cookies.

1P_JAR - Google cookie. These cookies are used to collect website statistics and track conversion rates.

NID - Registers a unique ID that identifies a returning user's device. The ID is used for serving ads that are most relevant to the user.

DV - Google ad personalisation

IDE, test_cookie, 1P_JAR, NID, DV, NID
IDE, test_cookie


These are essential site cookies, used by the google reCAPTCHA. These cookies use an unique identifier to verify if a visitor is human or a bot.