The Internet Agent
Displays a 450 MX Record Lookup Failure
Problem:
The Internet Agent has requested a lookup from the Domain
Name Server and did not get a response.
Action:
Check the resolv.cfg file for correct
configuration.
The resolv.cfg file should be in the
following format:
domain your_domain_name
nameserver ip_address
nameserver ip_address
nameserver ip_address
The domain name is first, followed by up to three nameserver
IP addresses. The following is a sample resolv.cfg file:
domain sgunix.org
nameserver 172.16.5.18
Possible Cause:
The IP address to your DNS has changed.
Action:
Update the resolv.cfg file.
Possible Cause:
TCP/IP is configured incorrectly.
Possible Cause:
There is a problem with your network interface card.
Possible Cause:
There is a problem with your network cabling.
Possible Cause:
The DNS server is down.
Possible Cause:
IP filtering has been added to the routers so the Internet
Agent cannot see the DNS server.
Action:
Ping the nameserver IP address to see if it is reachable from
the gateway station.
Action:
Ping the LAN segment router IP address.
Action:
Make sure the named Internet Agent program is running on the
nameserver server.
Possible Cause:
Outbound ports are disabled. TCP/IP can use port
1024 through 2099 or some other range of outbound ports for sending.
Action:
Check with your Internet service provider for the outbound
ports it uses.