diff options
Diffstat (limited to 'health/guides/portcheck/portcheck_connection_fails.md')
| -rw-r--r-- | health/guides/portcheck/portcheck_connection_fails.md | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/health/guides/portcheck/portcheck_connection_fails.md b/health/guides/portcheck/portcheck_connection_fails.md deleted file mode 100644 index 781cf7a01..000000000 --- a/health/guides/portcheck/portcheck_connection_fails.md +++ /dev/null @@ -1,32 +0,0 @@ -### Understand the alert - -This alert indicates that too many connections are failing to a specific TCP endpoint in the last 5 minutes. It suggests that the monitored service on that endpoint is most likely down, unreachable, or access is being denied by firewall/security rules. - -### Troubleshoot the alert - -1. Check the service - Investigate if the service at the endpoint (specific IP and port) is running as expected. Inspect service logs for issues, error messages, or indications of a shutdown event. - -2. Test the endpoint - Try to establish a connection to the flagged endpoint using tools like `telnet`, `curl`, or `nc`. These tools provide real-time feedback that can help identify problems with the endpoint: - - Example using `telnet`: - ``` - telnet IP_ADDRESS PORT_NUMBER - ``` - -3. Examine firewall and security group rules - Verify if there are any recent changes or newly added firewall/security group rules that might be causing the connectivity issues. Look for any rules that could be blocking the monitored port specifically or the IP range. - -4. Inspect network connectivity - Check the network connectivity between the Netdata Agent and the monitored endpoint. Ensure there are no intermittent network failures or high latency affecting the communication between the two. - -5. Examine the alert configuration - Validate the alert configuration in the `netdata.conf` file to confirm that the alert thresholds and monitored percentage of failed connections are set appropriately. - -6. Check resource utilization - High resource utilization might affect the availability of the monitored endpoint. Check if the system hosting the service has enough resources available (CPU, memory, and storage) to serve incoming requests. - -### Useful resources - -1. [How to use netcat (nc) command: Examples for network testing/debugging](https://www.nixcraft.com/t/how-to-use-netcat-nc-command-examples-for-network-testing-debugging/3332) |