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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How do I change password under Redhat Enterprise Linux?

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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 in the Postfix SMTP client (smarthost) 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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