SSH errors and tips - Ubuntu

If you're trying to connect to remote machine via ssh and receiving the error below:

"ssh: connect to host <hostname> port 22: Connection refused"

Follow the instructions below to solve this issue:

// Login directly to the remote machine

// Check that the ssh service on the remote machine is running
[user@server]$ sudo service ssh status

If you receiving the following massage: ssh stop/waiting than the ssh service is not running.

// Restart the ssh service
[user@server]$ sudo service ssh restart

It will pop up the following massage: 
ssh start/running, process <process number>


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If you're trying to connect to remote machine via ssh and receiving the error below:

"Read from socket failed: Connection reset by peer"

Follow the instructions below to solve this issue:

// Login directly to the remote machine

// Check that the ssh service on the remote machine is running
[user@server]$ sudo service ssh status

// Generate the public/private keys:
[user@server]$ sudo sshd-generate

Dhcp3-server installation failed - Ubuntu

If you're trying to install the dhcp3-server in ubuntu linux and you're retrieving the following error:

"The following packages have unmet dependencies:
dhcp3-server: Depends: dhcp3-common (= 3.1.3-2ubuntu3.2) but 3.1.3-2ubuntu3.3 is to be installed E: Broken packages"

Follow the instructions below to solve this issue:

// Install the synaptic package
[user@server]$ sudo apt-get install synaptic

// Run the synaptic package (to run the synaptic app you should work in GUI mode)
[user@server]$ synaptic

In Synaptic application search for the dhcp3-common > Select it >
From the menu bar click on Package > Force Version... >
In the popped up window select the following forced version to be installed:
Force version: 3.1.3-2ubuntu3.2 (stable)

This process will do the following:

1. Remove the packages below: 
• dhcp3-client
• wicd 
• wicd-daemon
• wicd-gtk
2. Downgrade the dhcp3-common package

Click on the Apply button

// Install the dhcp3-server package
[user@server]$ sudo apt-get install dhcp3-server

// Install the dhcp3-client package
[user@server]$ sudo apt-get install dhcp3-client

// install the wicd package
[user@server]$ sudo apt-get install wicd

NFS mount error - CentOS

If you're retrieving:  "clnt_create: RPC: Program not registered"
when you're trying to view mounted NFS folder (/nfsshare) on the local server by running:

[root@server]# showmount localhost -e

Follow the steps bellow to fix this issue:

// Check the exports file for the mounted (/test) directory
[root@server]# vi /etc/exports

You should see something like the following:
/nfsshare                  *(rw, sync)

// Check that the nfs service is running

[root@server]# service nfs status

If you're getting error than your nfs service is not running

// Restart the nfs restart

[root@server]# service nfs start

You should see the following:
Starting NFS services:    [ OK ]
Starting NFS mountd:      [ OK ]
Stopping RPC idmapd:   [ OK ]
Starting RPC idmapd:     [ OK ]
Starting NFS daemon:    [ OK ]

Now the command should work fine :)

How to fix Scheduling Assistant didn't show Free\Busy information

If you are working in Outlook 2007 and it does not show the available times for users in the Scheduling Assistant, and you getting the following error: "Your server location could not be determined. Contact your administrator".

Follow the instructions below to solve this:

Close the Outlook Program
Click on Start > Run > 
Type regedit in the open box
Browse to the following path:  HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Calendar
Right click on Calendar > New > Dword (32-bit) Value

Name it: UseLegacyFB
Open the UseLegacyFB > set it with the value: 1