pam_stack is deprecated as it won't be accepted upstream and there is a replacement for its functionality. Also there is a new common pam configuration file for all config utilities (system-config-*). Please use the attached pam configuration files for system-config-nfs.
Created attachment 119911 [details] system-config-nfs.pam
fixed in "upstream" CVS
From User-Agent: XML-RPC system-config-nfs-1.3.16-0.fc4.2 has been pushed for FC4, which should resolve this issue. If these problems are still present in this version, then please make note of it in this bug report.
fixed in system-config-nfs-1.3.16-1