If you have a little bit knowledge, then you know that this error issue is temporary. So, in the beginning, you have to ensure that the issue is associated with Yahoo and you should give some time to your machine to resolve that issue automatically. If the issue does not resolve automatically, then go to the next method.
Make sure that you have a strong internet connection. And if you don’t have any internet issue, only after that you should go to the next solution.
If the error issue still persists after trying the above two solutions, then try the other solutions. And to do that ensure that you are currently using the latest version of the Yahoo app. If not, then you should upgrade it and after that, restart your machine and in case you face the same error 14 code, then have a look to the below solution
Check if any third party software like adds is enabled or not. If yes, then turn on your machine in the Safe mode. After that make the required changes, and then bring your machine back to the normal mode.
Also, check your security software. Such as firewall settings, your usable antivirus that may prevent you to open your Yahoo mail account. So, what you can do is to turn off each of the software and find which software create trouble for you
You can also check that if your computer is updated with the latest software and drivers. At the same time, you should scan your computer to check if your system is affected by any malware virus. Now, this error code will not appear on your screen.