Also i see below message in /var/adm/messages.

Mar 19 15:55:13 TASMAN440 automountd[13109]: [ID 784820 daemon.error] server 47.152.227.17 not responding

But nfs.server is running on the machine 47.152.227.17 and I am able to manually mount the home-diretoyr /export/home onto the new machine 47.152.227.18. Could someone tell me what could be wrong?