If the service fails or doesn’t respond, we kill the dead process and restart the service. Our Hosting Engineers determine if the SSH service is listening using the netstat command. The reason for service failure could be disk errors, resource outages, traffic spikes, etc. If this service fails, the PuTTY SSH client can’t communicate with the SSH server, resulting in ‘ localhost connection refused‘ error. In other words, SSH service uses sshd daemon to process incoming connections, authentication requests, etc. Similarly, another common reason for this error is that the SSH service is not running or the SSH server is broken. iptables -A INPUT -p tcp -dport 22 -j ACCEPT 2) Service Downtime Further, we edit the firewall configuration to accept all connections to the SSH port. If we find any firewall rules that interfere with the connection to the SSH port, we’ll remove that rule from the firewall configuration.įor example, if we see a DROP or REJECT rule on SSH port for all connections, we’ll remove that rule from the firewall. In addition to that, we check the connectivity to the SSH port with the telnet command. After that, we check the server logs to identify the reason for the block. iptables -nLĪnd if it’s blocked, we unblock that IP address and restore the connectivity immediately. For example, we use the following command to check the rules in iptables firewall. How we fix?įirstly, our Hosting Engineers check that the IP address of the user is blocked in the server firewall. Similarly, server owners switch the default SSH port to a custom one, but failed to open that port on the server. We’ve seen cases in which the IP address or IP range of the customer is blocked on the server due to an abnormal behavior. 1) Firewall restrictionsįirewall blocking connections from a specific IP address/IP ranges or target SSH ports is one of the common reasons for this error. Now let’s see the main reasons for this error in PuTTY client and how our Support Engineers help customers resolve this problem. ‘localhost connection refused’ error in PuTTY – Causes & Fixes Putty Fatal ErrorĪnd, this means the connection to the SSH host is routed, but the host doesn’t accept that request. In a PuTTY client, users see the below error message when trying to connect to the server. Users usually use the PuTTY client to access the server remotely through SSH.Ī Connection refused error means that the server refused the connection made by the application. ‘localhost connection refused’ error in PuTTY – What’s this? Today, we’ll discuss the top 5 reasons for this error and how we fix them. Is this a server side or a client side problem? Well, it can happen at both sides.Īt Bobcares we help server owners resolve these errors as part of our Support Services for web hosts. PuTTY provides a convenient way to access servers.īut, things can go wrong when it can’t communicate with the server, and users see an error like “ localhost connection refused” in their PuTTY client.
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