The following issues were discovered on the affected server:
\\<machine>\C$\Program Files\ArcGIS\Server\framework\etc\config-store-connection.xml\\<machine>\C$\Program Files\ArcGIS\Server\framework\etc\machine-config.xml
<HTTPS>6443</HTTPS>\\<fileserver>\share\config-store\machines\<MACHINE>.<DOMAIN>.jsonIdeally a second machine in the site would allow simply re-joining the site. In this case the config-store existed on a shared path with no machines actively participating. Options considered:
webgisdr backupThe manual fix below resolved the situation without a full restore.
Warning: Stop ArcGIS Server before modifying any configuration files.
Shutdown ArcGIS Server
Restore config-store-connection.xml
Copy a known-good file from a separate deployment into:
C:\Program Files\ArcGIS\Server\framework\etc\config-store-connection.xml
Update the connectionString to reference the correct config store location.
Fix machine-config.xml
Edit the file and add the missing HTTPS port entry:
<HTTPS>6443</HTTPS>
Restore <MACHINE>.<DOMAIN>.json
Copy a known-good JSON file from a separate deployment into the config store path:
\\<fileserver>\share\config-store\machines\<MACHINE>.<DOMAIN>.json
Update machineName and adminURL to match the current machine.
A webgisdr backup archive may contain an extractable version of this file.
Start ArcGIS Server
Check that the JSON file in the config store is valid (not empty/corrupted):
C:\arcgisserver\config-store\machines