Locally use crt to connect to the virtual machine

The first step: Use the command to view the local ip

ifcongig -a

At this time, use the crt connection to find a connection error, then perform the second step

Step 2: Install ssh on the virtual machine, after installation and monitor whether the connection port monitoring is started

sudo apt-get install openssh-server       安装ssh

netstat -nat | grep 22       监控22端口是否已经占用 

Step 3: Turn off the firewall (this is the main reason why crt cannot connect)

sudo ufw disable

After performing the above three steps, crt can be connected