Web server regional slowdown

Question

We have an AWS ELB web-server and have several customers over the past 2wk in the central time-zone that had slow response times and, in some cases, 504s.  The load-balancer is auto-scaling and we have scheduled scaling to handle peak times but customer are still reporting the issues.  I'm not sure where to begin because it does appear regional and the logs don't show errors...but the ELB console does show occasional events like "Environment health has transitioned from Ok to Warning. 37.0 % of the requests are erroring with HTTP 4xx."

Answer

Hello.

Even if the ELB is reporting 4XX errors, they might be caused by the application behind it.
Inspect application logs to find any errors or anomalies. If you’re using an application like WordPress, check the PHP error logs. If you’re using a custom application, look at the specific logs it generates.
If your application relies on a database, ensure that the database isn’t the bottleneck. Look for slow queries, high CPU utilization, or issues with IOPS. Consider using Amazon RDS Performance Insights or third-party tools to analyze database performance.

Regards, 
Andrii

Web server regional slowdown

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