How do I change or set my hostname ( computer name ) under OpenBSD operating system?
Q. My Oracle XE installation was working fine, but today I’m getting an error – which read as follows under Ubuntu Linux :
ORA-12154: TNS:could not resolve the connect identifier specified
How do I fix this problem without reinstalling Oracle?
Continue reading “ORA-12154: TNS:could not resolve the connect identifier specified Error and Solution”
Q. I have just installed Ubuntu 6.06 and I would like to allow remote login to my system from home via ssh. How do I install and configure SSH server?
A. OpenSSH is a FREE version of the SSH connectivity tools that technical users of the Internet rely on. Users of telnet, rlogin, and ftp may not realize that their password is transmitted across the Internet unencrypted, but it is. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other attacks. Additionally, OpenSSH provides secure tunneling capabilities and several authentication methods, and supports all SSH protocol versions.
Ubuntu SSHD Installation
Type the following two command to install both ssh client and server:
# sudo apt-get install openssh-server openssh-client
To be frank your server is ready by default. Just test it from your home computer or from same system with the command:
# ssh localhost
# ssh user@your-server-ip-address
How do I use ssh client?
Assuming that your server hostname is userver.mydomain.com and username is vivek, you need to type the following command:
# ssh email@example.com
To stop ssh server, enter:
# sudo /etc/init.d/ssh stop
To start sshs server, enter:
# sudo /etc/init.d/ssh start
To restart ssh server, enter:
# sudo /etc/init.d/ssh restart