If you require an expert to assist you in resolving your ongoing FTP issues? Our technical experts are available 24×7.SSH key pairs allow an additional level of security that can be used in conjunction with the SFTP protocol. To resolve the issue, create a folder /var/run/proftpd/.įTP error 421 service not available can occur as a result of firewall restrictions, an invalid FTP host, and other factors. ps aux | grep proftpdīesides that, we check to see if the FTP configuration files (/etc/nf and /etc/nf) are intact.Ĭheck that the ProFTPd configuration file (/etc/nf) refers to this directory. If the FTP service becomes unresponsive on the server, we can use the following commands to terminate the dead process and restart the service. The inetd/xinetd service listens on port 21 for connection requests and then starts proftpd and terminates the connection. For example, we always make sure that the ServerType parameter in the ProFTP configuration file is set to inetd on Plesk servers. Using the netstat command, determine which services are listening on FTP port 21.Īnd, if we discover that this port is being used by multiple applications or another instance of proftpd, we will reroute these applications to alternate ports. Similarly, problems can arise due to errors in the FTP service configuration file. This can also occur if the server’s ProFTP service becomes stuck. Typically, this error occurs when another application is already using port 21. proftpd 127.0.0.1: Check to see if inetd/xinetd, or another proftpd instance, is already using ::, port 21 proftpd 127.0.0.1: Failed binding to ::, port 21: Address already in use Most importantly, if customers are blocked at the ISP or local firewall level, we always recommend that they connect via SFTP, which uses SSH.Īnother variant of this error in ProFTP servers is shown below. This enables us to determine whether the issue is on the intermediate level. This assists us in determining which application is causing issues.Īlternatively, if the issue is at the ISP’s end, we obtain the customer’s traceroute results.
#CORE FTP LE 421 ERROR WINDOWS#
If there are no server-side issues, we notify customers and instruct them to gradually disable their security applications such as antivirus, Windows firewall, and so on. Later, we notify the customer of the reason for the block and the remedial measures. csf -g xx.xx.xx.xxĪdditionally, if the IP address is blocked, we will immediately unblock it and restore FTP access. Additionally, ISPs can block outbound FTP traffic.ĭetermine whether the customer’s IP address xx.xx.xx.xx is blocked using the following command. We’ve seen instances where a third-party firewall or antivirus is blocking FTP connections on the system. Similarly, another possibility is that the user’s outbound connections are being blocked at the ISP or at their local firewall.
The IP address may be blocked for a variety of reasons, including abnormal activity, excessive connections, and so on. We’ve seen instances where the remote server refuses to accept connections from a particular IP address or range of IP addresses.
On Plesk servers, the hostname is changed via Tools & Settings > Server Settings.Īnother possibility for this error is that the firewall configurations or restrictions are incorrect. Important: Restart the network service to take effect. If ping doesn’t work, add the correct hostname in the server configuration files. The ping command is used to determine the FTP host’s connectivity. getaddrinfo 'Hostname_Is_Here' error: Name or service not known warning: unable to determine IP address of ' domain Additionally, this error is recorded in the server logs (/var/log/messages). This error can occur when the FTP server is unable to determine the server’s IP address from the hostname. Now, let’s discuss the most frequently occurring causes of this error and how our server management team resolve them. However, this is a temporary condition, and the action may be requested again.Īdditionally, the FTP error 421 service not available indicates that the connection to the remote server is unavailable.
#CORE FTP LE 421 ERROR CODE#
FTP error code 4xx indicates that the connection was not attempted and that the requested action did not occur.
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