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Operating Systems Linux Red Hat Mail Problem. Maybe, it is a DNS Problem! Post 302335481 by nitin on Sunday 19th of July 2009 04:01:38 PM
Old 07-19-2009
Wow! You are using really old OS Smilie. If it's DNS issue, then there are two thing you will have to look in to:
Code:
/etc/resolv.conf

Make sure that your search domains and name servers are correctly entered.

Next look in to Iptables rules. Check to see if something is being blocked e.g. traffic to DNS server or DNS all together. I'd suggest you to post your rules here.

-Nitin Smilie
 

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rpc.nisd_resolv(1M)													       rpc.nisd_resolv(1M)

NAME
rpc.nisd_resolv - DNS service daemon for NIS SYNOPSIS
file_descriptor]] transport] program_number] DESCRIPTION
is an auxiliary process which provides DNS forwarding service for NIS hosts requests. The process is started by (NIS server) when invoked with the option. It requires the file to be set up for communication with a DNS nameserver. The utility can be used to verify communica- tion with a DNS nameserver. See resolv.conf(4) and nslookup(1). Although it is not recommended, can also be started independently with the following options. Options Uses the specified file descriptor for service Runs in foreground. Uses the specified transient program number for RPC service procedure. Uses the specified transport. Operates in verbose mode. Sends output to: Operates in verbose mode. Sends output to stdout. AUTHOR
was developed by Sun Microsystems, Inc. FILES
resolver configuration file. SEE ALSO
nslookup(1), ypserv(1M), resolv.conf(4), ypfiles(4). rpc.nisd_resolv(1M)
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