# Pmm-agent "404 Not Found" trying to register with server **URL:** \ **Category:** PMM 3.x\ **Created:** [June 6, 2025, 7:06pm UTC](https://forums.percona.com/t/pmm-agent-404-not-found-trying-to-register-with-server/38231 "2025-06-06T19:06:03Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![DCL-aliens](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@DCL-aliens](https://forums.percona.com/u/DCL-aliens)\ **Post date:** [June 6, 2025, 7:06pm UTC](https://forums.percona.com/t/pmm-agent-404-not-found-trying-to-register-with-server/38231/1 "2025-06-06T19:06:03Z")
Hi, Just venturing in to the Percona monitoring world. I’ve got the server set up in an Ubuntu 24.04 VM with the script that installs docker and the latest container (pmm-server:3). That’s all working fine as far as I can tell. I’m able to get to the web UI. I’m trying to set up a pmm-agent (pmm-agent 2.24, mysql 5.7, Ubuntu 16.04) to connect to the server and am consistently getting a “404 Not Found” when running the base configuration. - The agent is running. - The config file is owned by pmm-agent. - I’ve checked basic connectivity between client-server and get a 200OK when running a curl from client to server on tcp/443; - Getting a mysql version string when runing a netcat test from server to client. I’ve just been following the instructions [here](https://docs.percona.com/percona-monitoring-and-management/3/quickstart/quickstart.html#connect-database) along with other ```auto # pmm-agent setup --server-insecure-tls --server-address=se.rv.er.ip:443 --server-username=admin --server -password=SUPER_GOOD_PASSWD --debug INFO[2025-06-06T14:34:01.376-04:00] Using /usr/local/percona/pmm2/exporters/node_exporter component=setup INFO[2025-06-06T14:34:01.376-04:00] Using /usr/local/percona/pmm2/exporters/mysqld_exporter component=setup INFO[2025-06-06T14:34:01.376-04:00] Using /usr/local/percona/pmm2/exporters/mongodb_exporter component=setup INFO[2025-06-06T14:34:01.376-04:00] Using /usr/local/percona/pmm2/exporters/postgres_exporter component=setup INFO[2025-06-06T14:34:01.376-04:00] Using /usr/local/percona/pmm2/exporters/proxysql_exporter component=setup INFO[2025-06-06T14:34:01.376-04:00] Using /usr/local/percona/pmm2/exporters/rds_exporter component=setup INFO[2025-06-06T14:34:01.376-04:00] Using /usr/local/percona/pmm2/exporters/azure_exporter component=setup INFO[2025-06-06T14:34:01.376-04:00] Using /usr/local/percona/pmm2/exporters/vmagent component=setup Checking local pmm-agent status... DEBU[2025-06-06T14:34:01.377-04:00] POST /local/Status HTTP/1.1 Host: 127.0.0.1:7777 User-Agent: Go-http-client/1.1 Content-Length: 3 Accept: application/json Content-Type: application/json Accept-Encoding: gzip {} component=setup DEBU[2025-06-06T14:34:01.379-04:00] HTTP/1.1 200 OK Content-Length: 191 Content-Type: application/json Date: Fri, 06 Jun 2025 18:34:01 GMT Grpc-Metadata-Content-Type: application/grpc { "agent_id": "", "runs_on_node_id": "", "server_info": null, "agents_info": [ ], "config_filepath": "/usr/local/percona/pmm2/config/pmm-agent.yaml", "agent_version": "2.24.0" } component=setup DEBU[2025-06-06T14:34:01.379-04:00] Status error: component=setup pmm-agent is running. Registering pmm-agent on PMM Server... DEBU[2025-06-06T14:34:01.380-04:00] POST /v1/management/Node/Register HTTP/1.1 Host: se.rv.er.ip:443 User-Agent: Go-http-client/1.1 Content-Length: 235 Accept: application/json Authorization: Basic YWRtaW46OUNtdmk0Vzl5QlJhZU1tRENNZ3NaQjhF Content-Type: application/json Accept-Encoding: gzip {"node_type":"GENERIC_NODE","node_name":"mysql-server-host.name","address":"cl.ie.nt.ip","machine_id":"/machine_id/92c78b7bbd5d4ad7b2345859b89c3dd3","distro":"linux","metrics_mode":"AUTO","disable_collectors":null} component=setup DEBU[2025-06-06T14:34:01.435-04:00] HTTP/1.1 404 Not Found Content-Length: 116 Connection: keep-alive Content-Type: application/json Date: Fri, 06 Jun 2025 18:33:56 GMT Server: nginx Strict-Transport-Security: max-age=63072000; includeSubdomains; { "code": 5, "message": "Endpoint not found: /v1/management/Node/Register, http method: POST", "details": [] } component=setup DEBU[2025-06-06T14:34:01.435-04:00] Register error: &node.RegisterNodeDefault{_statusCode:404, Payload:(*node.RegisterNodeDefaultBody)(0xc0004785c0)} component=setup Failed to register pmm-agent on PMM Server: . ``` ---
**Author:** ![nurlan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/nurlan/32/1523_2.png) [@nurlan](https://forums.percona.com/u/nurlan)\ **Post date:** [June 8, 2025, 9:41am UTC](https://forums.percona.com/t/pmm-agent-404-not-found-trying-to-register-with-server/38231/2 "2025-06-08T09:41:07Z")
Hi, seems like you are trying to connect PMM 2 Client to PMM 3 Server. Can you please check PMM Server version? ---
**Author:** ![DCL-aliens](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@DCL-aliens](https://forums.percona.com/u/DCL-aliens)\ **Post date:** [June 9, 2025, 3:50pm UTC](https://forums.percona.com/t/pmm-agent-404-not-found-trying-to-register-with-server/38231/3 "2025-06-09T15:50:06Z")
Yep. I had the exact same thought over the weekend. I was operating on the assumption was that 3 was backwards compatible… but then my now relaxed-brain determined that it might not be. 🙂 ---
**Author:** ![nurlan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/nurlan/32/1523_2.png) [@nurlan](https://forums.percona.com/u/nurlan)\ **Post date:** [June 10, 2025, 9:36am UTC](https://forums.percona.com/t/pmm-agent-404-not-found-trying-to-register-with-server/38231/4 "2025-06-10T09:36:24Z")
PMM 3 Server has limited backward compatibility with PMM 2 Client. Basically it supports compatibility for metrics delivery from PMM 2 clients to PMM 3 server. It was done for those who upgrade their servers and it take time to upgrade all PMM 2 Clients. ---
**Author:** ![DCL-aliens](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@DCL-aliens](https://forums.percona.com/u/DCL-aliens)\ **Post date:** [June 10, 2025, 2:10pm UTC](https://forums.percona.com/t/pmm-agent-404-not-found-trying-to-register-with-server/38231/5 "2025-06-10T14:10:25Z")
But I’m guessing that registration itself does not work. I installed a pmm2 server, registration is working fine. I’m unfortunately limited by the OSes that are installed on this MySQL cluster, they only seem to support the pmm2 client. ---
**Author:** ![nurlan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/nurlan/32/1523_2.png) [@nurlan](https://forums.percona.com/u/nurlan)\ **Post date:** [June 12, 2025, 7:01am UTC](https://forums.percona.com/t/pmm-agent-404-not-found-trying-to-register-with-server/38231/6 "2025-06-12T07:01:04Z")
Yes, registration and all pmm-admin commands doesn’t work