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authentication

I've compiled and install an application called gpass on CentOS v5.6. But, when I run the application it does not accept any password from $HOME/.gpass and displays the following error on screen:

libglade-WARNING **: could not find signal handler 'gpass_authentication_on_response'

How do I fix this problem and use the gpass software?
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Redhat Linux: Change User Password

How do I change password under Redhat Enterprise Linux?
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OpenSuse Linux: How to Read Logs (Log Files)

How do I read and/or view logs files under OpenSuse / Novell Enterprise Linux?
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My Squid proxy server running on port 3128. Since this is frequently scanned by adversaries looking for proxy servers; I've changed port to 10000 and restart squid. But my squid is not working on port # 10000 it only works on port # 3128? How do I force Squid to listen on uncommon port under CentOS Linux v5.3?
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What is the difference between authentication and authorization? Why it is important to understand difference between the two? Authentication vs. Authorization -- what are they and how do they differ?
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How do I support multiple ISP accounts (smarthost) in the Postfix SMTP client for relaying email? For example:

[a] user1@isp1.com must be relay via smtp.isp1.com.
[b] user1@isp2.com must be relay via smtp.isp2.com.
[c] me@mycorp.com must relay all my default email via smtp.mycorp.com.
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I'm trying to login using ssh keys but server is only allows to login me using a password. The following message is logged into server /var/log/secure file:

Feb 25 06:36:50 ns5 sshd[26681]: Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys2

How do I fix this problem?
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