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34 Chapter 6. Troubleshooting

First, in a text editor, remove the offending machine information, like so:

127.0.0.1 localhost.localdomain.com localhost

Then, save the ﬁle and attempt to re-run the RHN client applications or the Apache HTTP

Server. If they still fail, explicitly identify the IP address of the Proxy in the ﬁle, such as:

127.0.0.1 localhost.localdomain.com localhost

123.45.67.8 this_machine.example.com this_machine

Replace the value here with the actual IP address of the Proxy. This should resolve the

problem. Keep in mind, if the speciﬁc IP address is stipulated, the ﬁle will need to be

updated when the machine obtains a new address.

6.6. Connection Errors

If your are experiencing problems that you believe to be related to failed connections,

follow these measures:

• Conﬁrm the correct package:

rhn-org-httpd-ssl-key-pair-MACHINE_NAME-VER-REL.noarch.rpm

is installed on the RHN Proxy Server and the corresponding

rhn-org-trusted-ssl-cert-*.noarch.rpm or raw CA SSL public (client)

certiﬁcate is installed on all client systems.

• Verify the client systems are conﬁgured to use the appropriate certiﬁcate.

• If using one or more RHN Proxy Servers, ensure each Proxy’s SSL certiﬁcate is prepared

correctly. If using the RHN Proxy Server in conjunction with an RHN Satellite Server

the Proxy should have both its own server SSL key-pair and CA SSL public (client)

certiﬁcate installed, since it will serve in both capacities. Refer to the SSL Certiﬁcates

chapter of the RHN Client Conﬁguration Guide for speciﬁc instructions.

• If the RHN Proxy Server is connecting through an HTTP Proxy, make sure the URL

listed is valid. For instance, the HTTP Proxy URL ﬁeld should not contain references to

protocols, such as http:// or https://. Only the hostname and port should be included in

the form hostname:port, such as your-gateway.example.com:8080.

• Make sure client systems are not using ﬁrewalls of their own blocking required ports, as

identiﬁed in Section 2.4 Additional Requirements.

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Red Hat NETWORK 4.1.0 - Guide d'installation Page 38