When using tabcmd to log in to Tableau Server or Tableau Cloud site from the computer running Tableau Server, the following error might occur:
Connection Refused
Log in using http://localhost as the site address. Note: This option will not work if SSL is enabled.
Install tabcmd on a different computer and log in from there.
Add Hyperforce IP addresses to the firewall allowlist.
Hyperforce New IP addresses
https://help.tableau.com/current/pro/desktop/en-us/publish_tableau_online_ip_authorization.htm#new_ip_addresses
Introducing Hyperforce - General Information & FAQ
https://help.salesforce.com/s/articleView?id=000388902&type=1
Schedule for Tableau Cloud Migration to Hyperforce
https://help.salesforce.com/s/articleView?id=001498774&type=1
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