![]() contact the firewall administrator or investigate the reason for the process not listening. So now you know what's causing the Connection refused message you should take appropriate action e.g. Note that this also tells us where the blocking firewall is. If the port is blocked by a firewall and the firewall has been configured to respond with icmp-port-unreachable this will also cause a connection refused message. Tcpdump: verbose output suppressed, use -v or -vv for full protocol decode This closes the connection and causes the Connection Refused message e.g. When a connection is attempted to an IP:port where nothing is listening, the response from the remote system to the initial SYN packet is a packet with the flags RST,ACK set. If you don't have access to the remote system and want to confirm the problem before reporting it to the relevant administrators you can use tcpdump (wireshark or similar). If you see some output then confirm that it's what you expect then see the firewall section below. If nothing is listening then the above will produce no output. AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using MacBook-Air-2020.local. flush dns: sudo killall -HUP mDNSResponder sudo killall mDNSResponderHelper sudo dscacheutil -flushcache. if you are expecting a process to be listening on port 22222 sudo netstat -tnlp | grep :22222įor OSX a suitable command is sudo netstat -tnlp tcp | grep '\.80 ' I have tried several things including: restart apache server - sudo apachectl restart. If you are then to determine if this is the problem, on the remote system run netstat or ss 1 e.g. First ensure that you are trying to connect to the correct system. This is by far the most common reason for the message. ![]() Nothing is listening on the IP:Port you are trying to connect to.The message 'Connection Refused' has two main causes: Understanding the cause of the message will ultimately lead you to solving your problem. Note: This message is a symptom of the problem you are trying to solve.
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