EALREADYEALREADY — Operation Already in Progress
A non-blocking connection attempt is already in progress on this socket.
ECONNREFUSEDNo process is listening on the target address and port, so the connection was actively refused.
The remote host received the connection attempt but no application is listening on the specified port.
Verify the target service is running with ss -tlnp. Check that it is bound to the correct interface. Verify firewall rules and port number.
# Check if service is running
systemctl status nginx
# Check if port is listening
ss -tlnp | grep 80EALREADYA non-blocking connection attempt is already in progress on this socket.
SIGALRM (14)A timer set with alarm() or setitimer() has expired.
ENXIOThe device specified by a special file does not exist or is not configured.
ENOEXECAn attempt was made to execute a file that is not in a recognized executable format.
SIGURG (23)Urgent or out-of-band data arrived on a socket.
ENOMEMThe system does not have enough available memory to fulfill the allocation request.