Tableau Online has been upgraded to 2018.3, it is possible that you will need to update your version of tabcmd.
Hi Sasha, thanks for the reply. I've been using old versions of tabcmd with new versions of Online for many years. I did try 2018.3 and it didn't help. The problem turned out to be that my script was connecting to https://online.tableausoftware.com instead of https://online.tableau.com/ and the old path stopped working today, that was the redirection error. Now I can publish to Tableau Online again using even the 9.3 version of tabcmd.