What Error Couldn't Open /usr/lib/dld.sl Means
If when attempting to telnet (or ftp or ssh) to a machine, the following message occurs:

crt0: ERROR couldn't open /usr/lib/dld.sl errno:000000023
crt0: ERROR couldn't open /usr/lib/dld.sl errno:000000023

This could mean that the machine to which you are trying to connect, is out of memory. Check for more than one version of Netscape running because it's a memory hog.