Resolving Jenkins Agent Connection Error: Fixed Port 8182 Not Reachable
This guide explains why a Jenkins agent fails to start with the error "provided port: 8182 is not reachable" and provides step‑by‑step troubleshooting methods such as network testing, Docker port mapping verification, and ensuring proper communication between the agent and master nodes.
Jenkins can be configured to have agents connect to the master node using a fixed port. In this case the fixed port is 8182.
When the agent starts, it reports the error "provided port: 8182 is not reachable", indicating that the network connection to the master’s port 8182 cannot be established.
The solution is to make sure the Jenkins agent machine can communicate with the Jenkins master on port 8182. You can test the connectivity with tools like telnet , and if the agent runs inside Docker, verify that the container’s port mapping matches the host port and that the correct port is exposed.
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