there is no security configuration of v9.3.1 and v10.0, if this the configuration you mean
i got this error on running from ArcGIS Server 10.0
Error Domain=org.brautaset.JSON.ErrorDomain Code=3 "Unrecognised leading character" UserInfo=0x661e4c0 {NSLocalizedDescription=Unrecognised leading character
i did every thing from restarting the service and remove it and add it again
but i'm still getting error ,
Attached to you the "Network Layer" Config