If the mount point starts with /cdrom, there's a bug in the way /etc/mnttab gets updated for HSFS CDroms in Solaris 2.4. Edit /etc/mnttab and remove the dev= entry for those mountpoints that give you trouble.
If the mount point name starts with /net/HOSTNAME, where HOSTNAME is some other host, it's probably Sun bug 1207057. Try patch 102785-01 or later (SunOS 5.4) or 102783-01 or later (SunOS 5.3). But if HOSTNAME is the current host, it's probably Sun bug 1220440; unfortunately, this bug is still open as of Jan 2nd 1996.
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