The Solaris arp command does not support the -n flag to avoid using the 
nameserver to resolve IP addresses when printing the arp table.  If there is a 
private IP address in use AND the internal DNS server doesn't have a zone for 
the private address space then the SSH prng code will hang for an indeterminate 
period of time (usually longer than a person will wait).

SSH tests for the existence of the -n flag by trying 'arp -a -n'.  
Unfortunately, Solaris' arp program interprets the second flag, -n, as a 
hostname and basically ignores it.

FIX:

Test by using "arp -n -a" or "arp -an".