If you are using Windows10 Home and you use Docker as a development environment, I think you are using Docker Toolbox. In this article, I will introduce the errors I encountered today (December 27, 2020) and the solutions.
The Docker Quickstart Terminal, which started up normally until the day before yesterday, suddenly stopped showing whales today. The error content of hitting docker-machine start default at the command prompt is like this.
(default) Windows might ask for the permission to configure a dhcp server. Sometimes, such confirmation window is minimized in the taskbar. listen tcp4 127.0.0.1:55712: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.
Probably, I think that Quickstart Terminal also had an error like this. (At that time, I didn't intend to write an article, so I didn't check it firmly.)
It seems that the port you want to use is already being used by someone.
Since it tells me the port number in the error content,
Run netstat -ano | find" 55712 " at the command prompt to find out the process ID.
After that, just in case, I checked the details of the process in Task Manager, terminated the process, and restarted Quickstart Terminal, and I was able to see the whale safely.
It wasn't as much as I would write here, but I'll write it down as my memorandum so that I won't panic in the future.
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