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SSH: Agent Admitted Failure To Sign Using The Key Error And Solution

I‘ve recently regenrated and uploaded a new public ssh-key using the ssh-copy-id command. Now I’m getting the following error:

ssh root@server3
Agent admitted failure to sign using the key.
root@server3’s password:

How do I fix this problem?
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Sysadmin because even developers need heroes!!!

ping command: TTL Expired In Transit Error and Solution

When I try to ping other UNIX / Linux / BSD or MS-Windows servers in our network I get the following message:

TTL Expired In Transit

How do I fix this problem?
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UNIX Source Command: Read And Execute Commands From File

What is the use of UNIX source command under bash or any other shell? How do I use source command under UNIX / OS X / Linux operating systems?
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Linux: Setup SSH To Tunnel VNC Traffic Though Internet

I have UNIX workstation and Linux server at work and Ubuntu desktop at home. It is recommended that I use ssh tunnel the VNC protocol for secure communication. How do I access my UNIX workstation desktop here at home over the Internet using ssh?
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mod_setenv: Lighttpd Send Custom Headers

How do I add a header to the HTTP request that was received from the client under Lighttpd web server?
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HowTo: Find Python Version

How do I find out python programming language version under UNIX / *BSD / Linux / Apple OS X operating systems?
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HowTo: Skip Bash For Loop

How do I skip bash for loop if certain condition is satisfied under UNIX / Linux / BSD / OS X?
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Run / Execute Command Using SSH

How do I run a command using ssh under UNIX, OS X, *BSD, and Linux operating systems?
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How To: Rename A File In Bash

How do I rename a file in bash under UNIX / OS X / Linux / BSD operating systems?
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Linux sudo Configuration

Q. Can you tell me how to configure sudo to provide access to end users? How do I allow to run programs with the security privileges of another user using sudo?
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