Do not allow "SMS" as Site Code Name
I found some customers which has "SMS" as name of SCCM site. This make a lot of problems with normal management. This name should also be make as do not allowed (wizard blocks also other names). And if already named, it should allow one time change.
We do document this, and this has been the case since at least SMS 2003.
I’ve also confirmed that Setup disallows you from using the several “reserved” site code names and has done so since at least 2012 SP2.
Was unattended setup used? That’s the only way I can think of that may have bypassed this validation.
AdminAdam Meltzer (ConfigMgr Product Team) (Software Engineer, System Center Configuration Manager) commented
@Kazzan that's very odd. I just tried running setup for 1710 and it wouldn't allow me to enter any of the reserved sitecode names (including SMS). "Site code" has a (!), and clicking Next pops up a dialog that says "Enter a unique site code by using a combination of three letters and numbers."
No, it was normal setup and currently allow this name "SMS" even without warning (customer installs latest CB build). Yes, the documentation does not recommend to use them, says that you can experience problems. But unfortunately, customers do not read the docs fully.