kezhenxu94 commented on issue #3539: Agent services not detected URL: https://github.com/apache/skywalking/issues/3539#issuecomment-536156344 > 1 What's the use of port 10800 11800 12800? I don't see any ports listening using 'netstat -anp | grep 12800' after SkyUI started. `11800` is for collecting trace data, `12800` is for UI to query, it can't be more obvious that your backend is not started successfully (I don't see any ports listening using 'netstat -anp | grep 12800') > 2 What do i need to config for agent using spring boot with a "java -jar" fashion? Do I need to specify like 'java -javaagent:/path-to/skywalking-agent.jar > -Dskywalking.agent.service_name=trace-api > -Dskywalking.collector.backend_service=localhost:**myAgentPort** > -jar xxx.jar' it's not **myAgentPort**, it should be **yourBackendPort** as the name `skywalking.collector.backend_service` suggests > 3 I find 3 config files: > /config/application.yml(SW_CORE_REST_PORT:12800 | SW_CORE_GRPC_PORT:11800) > /webapp/webapp.yml(listOfServers: 127.0.0.1:12800) > /config/agent.config(SW_AGENT_COLLECTOR_BACKEND_SERVICES:127.0.0.1:11800), which I think related with my problem, but my agent's port is 8013. > When I have several backend(agent) services, need to change all these config files ? most (if not all) of the configurations can be configured by command line parameters, such as `-DSW_CORE_REST_PORT=xxx`, but according to your questions above, I don't think you have read the documentation first, so **please read the documentation first before asking, otherwise, it would be difficult to communicate**
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