How access a remote machine via SSH behind a proxy?

If we want to access external server via SSH, it is possible that if we are behind a proxy we will not have access to port 22 used by SSH. As root, edit the file sshd_config: 

sudo nano /etc/ssh/sshd_config

Edit the line which states 'Port 22' and changed it by 'Port 443'. This port is used by 'https' so it will not be closed in the proxy. Switch over to the new port by restarting SSH. 

sudo /etc/init.d/ssh restart

Comments

Post a Comment

Popular posts from this blog

Installing Firebird ODBC driver on Ubuntu

Open Database Connectivity (ODBC) is a standard for accessing databases. ODBC is independent of programming language, database system and operating system.  If we have it available in Ubuntu, we should install as follows: sudo apt-get install unixodbc unixodbc-dev  The next thing we are going todo is install the driver we want to use to connect via ODBC. In this case we will install Firebird.  The first thing you have to do is download the driver for Firebird: http://www.firebirdsql.org/en/odbc-driver/ In our case we have chosen: OdbcFb-LIB-2.0.0151.i686.gz (Linux x86) Unpack the file " libOdbcFb.so" and copy to: /usr/lib Then we make sure that we have installed the Firebird client library: sudo apt-get install libfbclient2 Perhaps Openoffice and other programs insist on using a driver with the name "libgds.so" to connect to the Firebird database. If this happens we will create a symbolic link as follows: ln -s /usr/lib/libfbclient.so.2 /usr/lib/l...
Read more

Installing OCI8 on Ubuntu

If we want to use a database from PHP, we need to install OCI8 extension, which it will provide an API to the use of Oracle databases. Installing OCI8 on Ubuntu is not as easy as doing an apt-get, as it takes some SDK packages provided by Oracle and their distribution license prevents that can be included in Linux distributions. This means we will have to download and compile them ourselves.  Below is the steps to follow:  1. Install PEAR and PECL. sudo apt-get install php-pear 2. Download ''Oracle Instant Client''. We need at least the following packages 'Basic' and 'SDK'. 3. Unzip the files sudo mkdir -p /opt/oracle cd /opt/oracle sudo unzip instantclient-basic-linux-xxxxxxx.zip sudo unzip instantclient-sdk-linux-xxxxxxx.zip sudo mv /opt/oracle/instantclient_xx_x /opt/oracle/instantclient The 'X' should be replaced by the appropriate version. 4. Create symbolic links. cd /opt/oracle/instantclient sudo ln -s libclntsh.so....
Read more

Batch file to connect to an FTP and put a file

Recently I needed to create a batch file to back up a file on a FTP from another machine. It was not as trivial as might be expected initially, but once you've found out is pretty easy, I put it here in case someone finds it useful. You just have to create a file with execute permissions containing the following lines: #!/bin/bash ftp -n -v xxx.xxx.xxx.xxx << EOT user username password prompt put filename bye EOT
Read more