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1500 questions
72
votes
2 answers

Why is it so difficult to upgrade between major versions of Red Hat and CentOS?

"Can we upgrade our existing production EL5 servers to EL6?" A simple-sounding request from two customers with completely different environments prompted my usual best-practices answer of "yes, but it will require a coordinated rebuild of all of…
ewwhite
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72
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4 answers

Your system administrator does not allow the use of saved credentials to log on to the remote computer

At our office, all of our Windows 7 Clients get this error message when we try and RDP to a remote Windows 2008 Server outside of the office: Your system administrator does not allow the user of saved credentials to log on to the remote…
Pure.Krome
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72
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11 answers

How do I remove login credentials for a network location in Win7?

I just tried to access a folder like so: \\somecomputeronmynetwork\somelocation$ When going to this location I'm prompted for a user name and password. I put one in, and it let me in fine. Now I need to remove that login, so I can try a different…
Joseph
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72
votes
8 answers

Quickest way to transfer 55GB of images to new server

I currently have two CentOS servers. I need to know how and what the quickest way would be to "tar" up the images directory and SCP it over? Is that the quickest way that I just suggested, because tarring is taking forever... I ran the command: tar…
Andrew Fashion
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72
votes
5 answers

Active Directory explained

If you had to explain Active Directory to someone how would you explain it?
user6848
72
votes
11 answers

How can I choose between using my ISP's DNS, or Google's 8.8.8.8?

It seems like a good idea to use Google's public DNS 8.8.8.8 and 8.8.4.4 because it's really fast -- much faster than my own ISP's DNS! -- and probably more reliable, too. That seems like a ridiculously quick win for me, and much easier to…
Torben Gundtofte-Bruun
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72
votes
17 answers

Does orientation affect hard drive lifespan?

Are there any studies or evidence which show that mounting a hard drive horizontally is better than vertically for the lifespan of the device? Or upside down, or any direction for that matter.
Bob
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72
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1 answer

How long does it take for DNS records to propagate?

This is a Canonical Question about DNS Propagation How long does it take for an the various types of records to propagate? Do some propagate faster than others? Why does it take time for DNS records to propagate and how does it work?
user38535
72
votes
1 answer

What is the difference between a Source NAT, Destination NAT and Masquerading?

What is the difference between a Source NAT, Destination NAT and Masquerading? For example, I thought IP Masqurading was what they used to call it in Linux? But what confuses me is that in our Astaro firewall there is IP Masquarading as well as NAT…
hookenz
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72
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3 answers

How do I change the privileges for MySQL user that is already created?

I understand how to create a new user with privileges, but what is the correct way to change privileges for users that are already created? We are running a DB audit and some of the users have way more access then is needed. Plus I don't know the…
Clutch
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72
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15 answers

Should I respond to an "ethical hacker" who's requesting a bounty?

I run a small internet based business from home and make a living at it to feed my family, but I'm still a one man show and internet security is far from my area of expertise. Yesterday I received two emails from a guy who calls himself an "ethical…
Vincent
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71
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21 answers

How the heck is http://to./ a valid domain name?

Apparently it's a URL shortener. It resolves just fine in Chrome and Firefox. How is this a valid top-level domain? Update: for the people saying it's browser shenanigans, why is it that: http://com./ does not take me to: http://www.com/? And, do…
Christopher
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71
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8 answers

Securely add a host (e.g. GitHub) to the SSH known_hosts file

How can I add a host key to the SSH known_hosts file securely? I'm setting up a development machine, and I want to (e.g.) prevent git from prompting when I clone a repository from github.com using SSH. I know that I can use StrictHostKeyChecking=no…
Roger Lipscombe
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71
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6 answers

How to remove strict RSA key checking in SSH and what's the problem here?

I have a Linux server that whenever I connect it shows me the message that changed the SSH host key: $ ssh root@host1 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ …
setatakahashi
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71
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18 answers

`mysql_upgrade` is failing with no real reason given

I'm upgrading from MySQL 5.1 to 5.5, running mysql_upgrade and getting this output: # mysql_upgrade Looking for 'mysql' as: mysql Looking for 'mysqlcheck' as: mysqlcheck FATAL ERROR: Upgrade failed Any ideas on where to look for what's happening…
Jim Rubenstein
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