Iinvestigation: Check nodes total, be familiar with the environment (connection flow, device/software naming). Check resources via monitoring command and monitoring graph. Check network & port connection, check the firewall. Check variable, naming, username, hostname, domain name. Check Linux processes. Check installation guideline/steps, operation procedures. Check speed (network, disk i/o, CPU, memory). Check log messages. Check software dependency (library). Check software environment (Linux environment)/virtual environment. Check user, file & directory permission. Check, coordinate and communicate with colleagues, supervisor, and 3rd party. Check user and vendor. Check notes. Check history. Check and crosscheck with other information. Check browser inspection. Check limitation(DB connection, java max connection, kernel max connection, etc). Check and run the app in debug mode. Check and compare with another environment, another end client. Check
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