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First, this is NOT the place to get "urgent" help. If you have a down system, contact Oracle Support.
follow the scan document http://www.lmgtfy.com/?q=oracle+scan+pdf
what is the output of the following -obfuscate any host names by substituting node1... node2... etc..?
srvctl status scan
srvctl status scan_listener
srvctl status listener
on EACH node:
sqlplus / as sysdba
show parameter listener -- this will show local and remote listener.
If you nslookup <your-scan-address> do you get 3 IP addresses returned?
Comment out the <your-scan-address> from the /etc/hosts file
make sure ALL public and public-vip addresses are in both /etc/hosts AND DNS.