Checkmk Werk 15656: Agent TLS registration: Fix `500 Internal Server Error` during register and status

ID: 15656 Title: Agent TLS registration: Fix `500 Internal Server Error` during register and status Component: agents Level: 1 Class: Bug fix Version: 2.1.0p26 When registering new agents (<tt>cmk-agent-ctl register</tt>) or querying the status of registered agents (<tt>cmk-agent-ctl status</tt>), users might have encountered the error C+: Error: Request failed with code 500 Internal Server Error: Internal Server Error (!!) C-: This happened if the path <tt>/opt/tmp</tt> existed on the monitoring server and the corresponding site user did <i>not</i> have read permissions for this path. If this happened, the log file <tt>var/log/agent-receiver/error.log</tt> contained errors such as C+: [ERROR] Exception in ASGI application Traceback (most recent call last): ... PermissionError: [Errno 13] Permission denied: '../../../tmp/check_mk/data_source_cache/push-agent/my-host' C-: