ad_conn:
Note that this information is only available if you have a
connection. A common error is to include this within a scheduled
procedure that runs when no connection is available.
By the way, I tried to add this to the ad_conn documentation in api-doc, but I didn't have permission to commit it. If anybody else wants to commit that blurb in
/packages/acs-tcl/tcl/request-processor-procs.tcl
feel free.