Fix AWS EC2 "Not Authorized to Perform ec2:RunInstances" Error
"Not authorized to perform: ec2:RunInstances" almost never means what people assume it means. It rarely means you lack permission ...
Category: Cloud
Why Is Your AWS EC2 T3 Instance So Slow? CPU Credits & T3 Unlimited Explained
If your t3 instance suddenly got slow, open CloudWatch and look at two things: the instance's credit specification (Standard or Unlimite...
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Fix AWS EC2 EBS Volume Stuck Attaching or In-Use Error
If your Amazon EBS volume is stuck "attaching," "detaching," or shows "in-use" with nowhere actually attached,...
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How to Fix AWS EC2 Instance Stuck in Stopping State Step-by-Step
If your EC2 instance has been sitting in the "stopping" state for more than 10-15 minutes, force stop it: in the console, select t...
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Fix AWS EC2 "Instance Limit / vCPU Quota Exceeded" Error
The error means the vCPUs (virtual processor slices) you just asked for, added to the vCPUs already running in that Region, would go past a ...
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Fix AWS EC2 InsufficientInstanceCapacity Error: Meaning & Workarounds
InsufficientInstanceCapacity means AWS doesn’t have enough On-Demand capacity for your request right now, in the Availability Zone you aske...
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How to Fix AWS CLI Profile Not Found: Config vs Credentials File Rules
The AWS CLI says a profile "could not be found" when the exact name you passed with --profile or set in AWS_PROFILE doesn't ...
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How to Fix AWS API Gateway 502 Bad Gateway: Lambda Proxy Response Shape Rule
A 502 Bad Gateway from an API Gateway Lambda proxy integration almost always means your function ran fine and returned something that looked...
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How to Fix AWS API Gateway WebSocket Connection Fails ($connect, $disconnect,$default Routes)
A WebSocket API in API Gateway needs exactly three route keys defined — $connect , $disconnect , and $default — plus any custom route keys...
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How to Fix AWS API Gateway Custom Domain 403 Error (Base Path & Stage Routing)
If your API Gateway custom domain throws a 403 the moment you hit it — while the ugly default execute-api URL works perfectly — the cause a...
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Fix AWS API Gateway 429 Throttled: Account-Level vs Stage-Level Rate Limits Explained
If API Gateway is handing you 429 Too Many Requests , it isn't automatically your fault, and it isn't automatically your traffic. Th...
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How to Fix AWS CLI & Boto3 NoCredentialsError (Docker & Cron Metadata)
If boto3 throws NoCredentialsError: Unable to locate credentials inside a Docker container or a cron job, the fix is almost never about you...
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What is Amazon Aurora in AWS: RDS Grown Up, When Plain RDS Wins
Amazon Aurora is AWS’s high-performance relational database — a fully managed engine compatible with MySQL and PostgreSQL that delivers up t...
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What is Amazon Cognito in AWS - login without building login
Amazon Cognito is AWS’s identity platform for web and mobile apps — a user directory, an authentication server, and an authorization service...
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Fix AWS CLI Error: Could Not Connect to Endpoint URL (DNS & Region)
If the AWS CLI is throwing Could not connect to the endpoint URL , the cause is almost always one of three things: the region your command i...
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What is an AWS Lambda Cold Start? (Causes & 5 Fast Fixes)
A cold start is the extra bit of time AWS Lambda needs the first time your function runs on a brand-new copy of its environment — it has to...
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What is AWS Auto Scaling? (EC2 Auto Scaling Groups Explained)
Auto scaling is a cloud feature that automatically adds or removes servers to match the traffic your application is actually getting, right ...
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Fix AWS CLI ExpiredToken Error: Session Credentials Guide
The AWS CLI throws ExpiredToken — "The security token included in the request is expired" when the temporary session credentials ...
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AWS Bedrock AccessDeniedException on Claude: Every Fix
AccessDeniedException when invoking Claude models on AWS Bedrock almost always traces back to one of three separate gates that all have to o...
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What Is Amazon AWS SES? Email Your App Can Afford
Amazon SES (the full form is Simple Email Service) is AWS's email-sending platform — your application calls an API or connects over SMT...
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