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Be nice to see your active setup:
# /sbin/ifconfig -a # /sbin/route -n
You may have a problem with the IP gateway or DNS services. Can the server ping the gateway?
the problem appears to be that the resolv.conf file wasn't being used to resolve the dns name, i had to change the ifcfg-em1 file and put the dns entries there and the domain entry. this must be a change from oel5.8 where the dns entries were only required in the resolv.conf file
To make a DNS entry in the ifcfg-ethx file also exists under 5.8.
The DNS entry in the efcfg-ethx file is a name server address (TCP/IP address) to be placed in /etc/resolv.conf if the PEERDNS directive is set to yes. If using DHCP, then the PEERDNS directive is set to yes by default and updating your /etc/resolv.conf file accordingly.
It is possible that your initial /etc/resolv.conf file was incorrectly configured or had some format issue and therefore DNS services were not working.