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RHEL / Centos Linux Disable Firewall

How do I disable firewall on CentOS or Red Hat Enterprise Linux server version 5.x/6.x running on my HP micro server?
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Mount CD-ROM / DVD in HP-UX Unix

How do I mount CD or DVD on HP-UX Unix operating systems?
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How do I start, stop, or restart networking service under HP-UX, OpenBSD, AIX and other Unix like operating systems?
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I recently installed NFS server v4 on my HP Linux server. However, I'm not able to mount it from Linux nfs4 client using the following command:

mount.nfs4 server2:/data /data

I'm getting the following error:

mount.nfs4: mounting server2:/data failed, reason given by server:
No such file or directory

How do I fix this problem?
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I'm getting slow DNS response from ssh and other network related traffic with delay of 30-60+ seconds per connection. All of our servers are behind hardware based dedicated firewall. My RHEL v6.1 server system running on HP hardware. How do I fix this problem?
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When I run 'yum install package' or 'yum update' commands the yum command works normally until Running Transaction Test and hangs until the yum process is killed manually using the kill command. How do I fix this problem under CentOS Linux 5.x AMD64 running on HP server?
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Debian Linux: Set a Serial Console

How do I set up a serial console on Debian Linux HP server for troubleshooting and login purpose?
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