My interest in MSSQL 2017 on Linux has brought me to attempting a HA cluster to test out. I successfully created a CentOS 7 based SQL 2017 VM joined to a domain with AD auth etc - yay I then created three VMs with CentOS 7 not on the domain. Installed SQL 2017 with Dev, Dev and Express editions on MSSQL-N1, MSSQL-N2 and MSSQL-W. I have created working HA group(s) with a witness. I am now trying to create the cluster so that synchronous groups can fail over. The problem is I can auth all the nodes but when I try and create the cluster: Error: MSSQL-N1: unable to authenticate to node Error: MSSQL-N2: unable to authenticate to node Error: MSSQL-W: unable to authenticate to node I have cleared out the pcsd files and logs, there is no corosync conf file and restarted the service and tried again. I have changed the hacluster user password on all systems to be sure it is correct but it auths so that should be fine. If I curl -k https://mssql-w:2224/remote/node_available I get "notauthorized":"true" despite the pcs auth command suggesting it is authed. What am I doing wrong? It seems like it should be fairly straight forward.