Description of problem: After unpackaging the rpm for ncpf-2.26 the commands ncpmount does not work properly. It was giving me an error (-330) Invalid Server Response. Very strange since I have another machine but with Mandrivia 10.1 2006 and I unpackage the same file and it was working properly. What I did was to make an sftp session and copy mount.ncpfs from the computer with Mandrivia to the computer with FC5. Then suddenly it work! Therefore there must be a problem with the ncpfs-2.2.6 package you are supplying on the cds.
Have you checked the latest update for FC5?