I was having some real problems with CLI's not being able to open local ports to perform tasks that communicate with cloud services. In the current case, whenever I tried to authorize a Salesforce Org for use with the sfdx cli, I was getting an access permissions error:
`$ sf login org -l https://test.salesforce.com Error: listen EACCES: permission denied 127.0.0.1:1717 at Server.setupListenHandle [as _listen2] (net.js:1303:21) at listenInCluster (net.js:1368:12) at GetAddrInfoReqWrap.doListen [as callback] (net.js:1505:7) at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:71:8) { code: 'EACCES',