Anyone know how to set the apache user?

In material studio 6.1, when I start the gateway, the apache instance dies with invalid UID, viz:

getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive

For normal apache, I'd add
User apache
Group apache
or whatever to httpd.conf.  I tried that and got one successful startup, but a subsequent gw something overwrote my httpd.conf.  What's the correct way to set these options?  I didn't see anything searching in the install guide, but possibly I missed something...