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Outlook 2016 continually prompts for username and password constantly and will not sync

For the past month and a half or so Outlook 2016 will continually prompt for username and password to a point where I have to close it and re open it.  It also will not sync unless I close and reopen it.  This is getting really annoying.  First level support was all but useless.  I'm a network and email tech and have done pretty much everything on my end.  including:

1.  Deleting and recreating my profile, my .ost file, and any other file involved.

2.  Changed my password about 5 times, this will work for about an hour then it starts doing the same thing though it still doesn't sync.

3.  Verified all my settings and tested.

Basically first level support said they don't support 3rd party products like Outlook and to use the webmail.  This is not acceptable.  I read a similar post a couple of weeks ago where moving their account to a different email server solved the trick.  

  • I'm having the same issues for the past couple weeks now using Outlook for POP accounts during a send/receive. Once or twice a year, this happens with Cox. Right now, many times a day, I'm getting the infamous 'Enter Network Password' prompt and can't do anything, which is frustrating. This happens regularly, so please Cox...don't ask the usual questions about using Webmail, try another computer, etc. We know, and you know, this has been a persistent, recurring issue with Cox email accounts for many years. Usually, Cox hems & haws and says they're working on it...or they wrongly blame Outlook...and nothing gets resolved. After repeated complaints to report the issue, they'll usually reset or do something to solve the issue. So I'm adding my issue & complaint here to be resolved also. Please fix email issues ASAP. Thank you.
  • Same here plus the infamous "invalid server certificate" message they've been working on since June 2015.

  • This is not a machine specific problem either.  It does this on my laptop as well as my home PC.  Outlook won't open at all this morning, it just keeps popping up with the username and password prompt.  Sometimes it will come up with my password already filled in, then when I click submit it blanks out the password.  This is just getting ridiculous.   I'm paying Cox boatloads of money every month for high speed service but getting bupkis for support.  

  • Please try deleting your cookies and cache first, then restart your computer.  Also have you changed your password, but did not change it in your advanced settings? 

  • How do I delete cookies from Outlook?  For that matter, how do I clean the cache in outlook.  Password has been changed in advanced settings as well.  I enabled logging and this is what's in the log file when I attempt to login:

    IMAP: 13:07:25 [rx] * BAD Mail storage services unavailable, wait a few minutes and try again.
    IMAP: 13:07:25 [rx] 36zf NO [UNAVAILABLE] Account is temporarily unavailable.
    IMAP: 13:07:25 [db] ERROR: "The server rejected your logon. Verify that your user name and password are correct.", hr=0x800CCCD1

    Username and password are definitely correct.