Suddenly, I can't use Navicat to establish SSH tunnel but I can still use other SSH client to connect. Why?
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In your Linux server, you can find the following file - sshd_config.
If the parameter "AllowTcpForwarding" is set to the value "no", it will disable the SSH port forwarding. By default, after we installed SSH server, it should be set to "yes".
For this case, we would suggest you to consult with your ISP's network administrator.