Cant SSH Solaris servers

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http://www.unix.com – Hi all. Im working in a telco Environment and recently setup a new server. The other servers are a combination of Solaris + Linux machines. Using my new server , I can ping all other servers ( solaris + redhat linux ) but the issue lies where I try to ssh. I can only successfully ssh linux machines but cannot ssh any solaris machine though I can ping them. Do I need to change any configs on other machines ??? Regards (HowTos)