The ERRORLOG in C:\Program Files\Microsoft SQL Server\MSSQL15.SAGE100CON\MSSQL\Log will contain a message similar to the following:
"2025-11-20 13:43:32.10 spid53 SAGE ERROR 50006: Members of the sysadmin server role can only connect to this server from the server machine."
Workstations can't connect to the server from the program if the check mark is set in Database Administration, Advanced Settings, Advanced SQL Server Settings, Limit Access for members of the "sysadmin" role to this machine only.