# z/OSMF troubleshooting
The core command groups use the z/OSMF REST APIs which can experience any number of problems.
If you encounter HTTP 500 errors with the CLI, consider gathering the following information:
- The IZU* (IZUSVR and IZUANG) joblogs (z/OSMF server)
- z/OSMF USS logs (default location: /global/zosmf/data/logs - but may change depending on installation)
If you encounter HTTP 401 errors with the CLI, consider gathering the following information:
- Any security violations for the TSO user in SYSLOG
# Alternate methods
At times, it may be beneficial to test z/OSMF outside of the CLI. You can use the CLI tool
curl or a REST tool such as "Postman" to isolate areas where the problem might be occurring (CLI configuration, server-side, etc.).
curl command to
curl -k -H "Accept: application/json" -H "X-CSRF-ZOSMF-HEADER: true" "https://zosmf.hostname.net:443/zosmf/info"