We ran into something strange. We have a Solaris 10 NFS 4 that has serveral Redhat Linux NFS 3 & 4 clients. On the NFS 3 clients, we have permissions issues and of the NFS 4 clients we have connections issues. Users on the NFS 3 clients can't modify anything even if it seems they own it. NFS 4 clients can't connect unless we open every port on the firewall. Seems to be opening random ports and no one want to leave every port open. Any ideas?