In the Solaris 2 release, the /var/nis directory contained two files named hostname.dict and hostname.log. It also contained a subdirectory named /var/nis/hostname. Starting with the Solaris 2.5 release, the two files were renamed trans.log and data.dict, and the subdirectory is named /var/nis/data.
In the Solaris 2.5 release, the content of the files were also changed and they are not backward compatible with the Solaris 2 releases. Thus, if you rename either the directories or the files to match the Solaris 2.4 patterns, the files will not work with either the Solaris 2.4 release or current Solaris releases that use the newer version of the rpc.nisd command. Therefore, do not rename either the directories or the files.