Unable to register clients to RMT server - Your Registration Proxy server doesn't support this function. Please update it and try again.

This document (000019806) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 15 SP2

Situation

When trying to register a client to RMT server following error message occurs:

Your Registration Proxy server doesn't support this function. Please update it and try again.

Log file /var/log/nginx/rmt_https_error.log shows following error message:

2020/12/08 10:25:44 [error] 13913#13913: *22 connect() failed (111: Connection refused) while connecting to upstream, client: <rmt-server-ip>, server: <rmt-server-name>, request: "POST /connect/subscriptions/systems HTTP/1.1", upstream: "http://127.0.0.1:4224/connect/subscriptions/systems", host: "<rmt-server-name>"

Following command 'journalctl -u rmt-server' shows:
Dec 08 10:50:33 <server-name> systemd[1]: Started RMT API server. Dec 08 10:50:34 <server-name> rails[26817]: => Booting Puma Dec 08 10:50:34 <server-name> rails[26817]: => Rails 6.0.3.4 application starting in production Dec 08 10:50:34 <server-name> rails[26817]: => Run `rails server --help` for more startup options Dec 08 10:50:34 <server-name> rails[26817]: A server is already running. Check /usr/share/rmt/tmp/pids/server.pid. Dec 08 10:50:34 <server-name> rails[26817]: Exiting

Checking rails process, the pid is always differently:

ps auxf|grep rails _rmt 27230 100 3.1 202836 57360 ? Rsl 11:09 0:01 /usr/bin/ruby.ruby2.5 /usr/share/rmt/bin/rails db:create db:migrate RAILS_ENV=production From service definition the service is type simple and restart always: /usr/lib/systemd/system/rmt-server.service

Resolution

systemctl stop rmt-server

Remove the pid file if there is no running process:

rm /usr/share/rmt/tmp/pids/server.pid

then restart service:

systemctl start rmt-server

Cause

Pid file still exists while no running process.

Disclaimer

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