Database
MySQL Server Start Failed: Troubleshooting Startup Errors
Diagnose and fix MySQL server startup failures caused by permission issues, configuration errors, corrupted data, or port conflicts.
Published guide archive
Browse the latest published troubleshooting workflows
Move through published fixes 15 at a time without losing the newest-first archive order.
Java
How to Fix Java SQL Connection Failed Error
Resolve Java SQL connection failures with diagnosis steps for network, authentication, and configuration issues.
DNS
How to Fix Domain Locked: DNS Update Failed
Diagnose and resolve domain lock issues preventing DNS updates, nameserver changes, and domain transfers at registrar level.
DNS
How to Fix DNS SRV Record Configuration
Diagnose and fix SRV record problems causing service discovery failures for LDAP, Kerberos, SIP, and other protocols.
Java
How to Fix Java OutOfMemoryError: Java Heap Space
Resolve Java OutOfMemoryError for heap space with memory diagnosis, tuning, and code fixes.
Java
Fix Fix Java Nosuchmethoderror Issue in Java
Troubleshoot Fix Java Nosuchmethoderror issue in Java with targeted checks for logs, configuration, identity, dependencies, and rollback.
Java
How to Fix Gradle Build Failed Error
Resolve Gradle build failures with dependency resolution, configuration fixes, and cache troubleshooting.
Kubernetes
Fix Kubernetes Pod ImagePullBackOff
Resolve ImagePullBackOff errors when Kubernetes cannot pull container images from registries.
DNS
How to Fix Cloudflare DNS Error
Diagnose and resolve Cloudflare DNS errors including proxy mode issues, DNS record conflicts, and Cloudflare-specific configuration problems.
DNS
How to Fix DNS Propagation Delay: Changes Not Visible
Diagnose DNS propagation delays when your changes are not visible globally, and learn techniques to verify and accelerate the process.
Load Balancer
HAProxy Session Stuck: Diagnose and Fix Connection Issues
Resolve HAProxy session stuck issues with proper timeout configuration, connection draining, and session management techniques.
Load Balancer
HAProxy Queue Overflow: Fix Request Queue Buildup
Resolve HAProxy queue overflow issues by tuning connection limits, implementing rate limiting, and scaling backend capacity appropriately.
Java
Fix Fix Java Classnotfoundexception Issue in Java
Troubleshoot Fix Java Classnotfoundexception issue in Java with targeted checks for logs, configuration, identity, dependencies, and rollback.
Load Balancer
HAProxy All Backends Down: Complete Recovery Guide
Diagnose and fix HAProxy when all backends report as down, covering health check failures, network issues, and server-side problems.
DNS
How to Fix DNS TTL Caching Issues
Diagnose and resolve TTL caching problems causing stale DNS records, slow propagation, and inconsistent resolution.