If you connect to Outlook via a Mac email client and your organisation requires a fresh login after a sure phone number of days set by its security insurance , you might recover yourself enigmatically stymied and be unable to trouble-shoot the problem if you hit the same split I did of late .

After years of welcome weekly requests to do a login and two - gene authentication via my web browser app for an Outlook account , it on the spur of the moment give out . No amount of troubleshooting seemed to give up me to reconnect . Strangely , on a different Mac , hallmark keep to work without a hitch .

After a substantial amount of test and error , I identify a new while of software that I had installed interfered with my email client ’s web internet browser launch . The new software , PeakHour , operate on a tiny local web server to manage some data gathering about your Mac ’s datum utilization . As with all internet - based host , it requires a port number – a singular numeral that identifies a particular service on any net - connect twist , like e-mail , impregnable web browser app , and the like .

In trying to troubleshoot an unrelated internet trouble , I had installed PeakHour , which enable its server at porthole 8000 . What I did n’t substantiate ( and you ca n’t find documented anywhere ) is that either Outlook or some e-mail node use port 8000 to create a short - lived local web waiter to manage the certification with Microsoft ’s Outlook login systems . Because my email client could n’t launch a web page at porthole 8000 – the PeakHour page make out up or else – it fail to authenticate .

Most software that creates a local web host also has the selection to change the identification number . I changed it from 8000 to 8002 , re-start PeakHour , and was immediately able to get my Outlook email report work on again . Check the options for the software for such an alternative .

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