APM agent php issue

Elastic Observability APM
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If you are asking about a problem you are experiencing, please use the following template, as it will help us help you. If you have a different problem, please delete all of this text :slight_smile:

TIP 1: select at least one tag that further categorizes your topic. For example server for APM Server-related questions, PHP for questions regarding the Elastic APM PHP agent, or ui for questions about the APM App within Kibana.

TIP 2: Check out the troubleshooting guide first. Not only will it help you to resolve common problems faster but it also explains in more detail which information we need before we can properly help you.

Kibana version: 8.4.1

Elasticsearch version: 8.4.1

APM Server version: 8.4.2

APM Agent language and version: PHP

Browser version:

Original install method (e.g. download page, yum, deb, from source, etc.) and version:

Fresh install or upgraded from other version?
Fresh

Is there anything special in your setup? For example, are you using the Logstash or Kafka outputs? Are you using a load balancer in front of the APM Servers? Have you changed index pattern, generated custom templates, changed agent configuration etc.

Description of the problem including expected versus actual behavior. Please include screenshots (if relevant):

Steps to reproduce:
1.
2.
3.

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):
pool www: [Elastic APM PHP Tracer] 2022-09-23 06:49:01.434659+00:00 [PID: 15772] [TID: 16382] [ERROR] [Backend-Comm] [backend_comm.c:251] [syncSendEventsToApmServer] Sending events to APM Server failed. URL: https://ip-10-0-0-131.ap-south-1.compute.internal:8200/intake/v2/events'. Error message: Couldn't connect to server'. Current process command line: `PHP-fpm: pool www'

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4

Hi Pragadeeswar Padmanaban,

Could you check the following if the issue is still active:

  • Is the url valid?
  • Did you set the secret_token properly?
  • Is there a firewall active? Port 8200 might be blocked internally

Greetings,

5

Hello Peter,

I have the same problem, here's some more info :

  • The url is valid and the 8200 port is open : I can curl my apm-server from my php server and get a response.
  • When the error occurs, there is nothing appearing in my apm-server's logs
  • I tried with 2 different apm-servers, one on a remote server with an API-key and one on a localhost apm-server with no API-key
  • Both apm servers already work with the java apm agent
6

Can you check the php_info(); contents to see if the url and secret_token is filled in?

7

Thank you for your quick reply !

I finally managed to retrieve some data. The connection problem is due to SELinux blocking the connection. A quick workaround is to use setenforce 0

Sadly, we can't use this workaround in production for obvious reasons, but now we know it's not a configuration problem.