I have very painful experinece to authorize an Org. Most of the time it fails to authorize the Org and shows the below error. I restarted m/c , shutdown , kill the node.js process , re-install and install Vs code . But nothing works.
Any help is very much needed. 

Kill the process running on port 1717 or use a custom connected app and update OauthLocalPort in the sfdx-project.json file.
13:16:15.855 sfdx force:auth:web:login --setalias personal --instanceurl https://login.salesforce.com --setdefaultusername ended with exit code 1