I have inherited an AD site that's a bit of a mess. There is a WAN, however only one domain and all DCs and GCs are on the HQ LAN, there is one Exchange 2000 server also on the HQ LAN. All servers are Windows 2000.
In the process of cleaning things up and removing "non-essential" services, I disabled IISAdmin and SMTP on one of the Global Catalog servers. All of a sudden it started logging Inter-site messaging warnings (event id 1409, 1657) and errors (event id 1466, 1373), the gist of them being that the GC was trying to use SMTP for replication.
Since there is only the one site, there are no inter-site transports configured, and the replication transport for all DCs and GCs is set to RPC I am at a loss to explain and hopefully correct this behavior.
I have recently promoted one of the DCs to a GC and have seen no such messages in it's log, it has IISAdmin disabled and smtp is not even installed. The FSMO does have IIS installed and running as well as smtp, if that matters.
Thanks for any help!