Overview
XShell is a widely used remote server management tool. But what should you do when Xshell fails to connect? Here are several troubleshooting strategies.1. Check the port
Check the Port configuration in /etc/ssh/sshd_config (e.g., Port 2222). If the port has been changed, you need to update it accordingly in Xshell.
2. Firewall rules
iptables -L -n | grep 22 # iptables
firewall-cmd --list-ports # firewalld (CentOS/RHEL)
ufw status # Ubuntu (UFW)
Check whether the firewall has allowed the port.
firewall-cmd --add-port=22/tcp --permanent
firewall-cmd --reload
If the port is not allowed, you need to add it.
3. Verify the username
Check whether the server username is correct. Sometimes it is not the root username.
