LAMP & Oracle Technical Information

If you connect a server with ssh, you get an error message sometimes.

You get the following error after execute yum command. Probably yum is corruped.

Error :

Solution :

iCalendar is a computer file format which allows Internet users to send meeting requests and tasks to other Internet users, via email,
or sharing files with an extension of .ics. Recipients of the iCalendar data file (with supporting software, such as an email client
or calendar application) can respond to the sender easily or counter propose another meeting date/time.

By default, RHEL 6 configures two workspaces.

To increase the number of available workspaces :

1. Right click with the mouse on the workspace control in the panel.

2. Select Preferences.

3. Simply increase the Number of workspaces value to the desired number.

The name of each workspace may be changed by double clicking on the default name in the list
(Workspace 1, Workspace 2 etc) and typing in a new name.

The portreserve program aims to help services with well-known ports that lie in the portmap range. 
It prevents portmap from a real service's port by occupying it itself, until the real service tells it to release the
port (generally in the init script).

1. Install the package for RedHat / CentOS 6

If you install Nagios into CentOS v6, you need the following packages.
Check the packages before the installation.

iptables is administration tool / command for IPv4 packet filtering and NAT.

The firewall serves as an antidote to access from unwanted connections. This facility is an important and commonly used in server
environments to restrict any ports that might be accessed, both internally and externally.

To disable the firewall on Red Hat Linux system and its derivatives (Fedora, CentOS, etc) :

As root user >

It was being caused by GSSAPI authentication. The better option is to set PuTTY not to try using it.

PuTTY options :
Connection -> SSH -> Auth -> GSSAPI
Uncheck the 'Attempt GSSAPI authentication' checkbox.

Other option :
Disabled GSSAPIAuthentication in sshd_config in your Linux Server.
Explicitly disable GSSAPI authentication in SSH client program configuration file, i.e. edit the /etc/ssh/ssh_config and add in this
configuration.

1. create or edit a file named "agentID.txt" in /etc/Navisphere.

2. Add the hostname and IP address lines as described above. This file should contain only these two lines, without formatting.

3. Save the agentID.txt file.

1. Check the iptable status in Linux Server.

2. Modify the configuration file.

3. You will see default rules as follows.