I had a coder add some new programs to my Linux server - namely PHP-mcrypt, libmcrypt, GCC and yum. After doing this, none of the domains on the server will resolve. I am not a server admin so I don't know why this has happened or what it means and have had trouble getting a response from the coder who installed the programs.
It has been suggested to me that the A records for the main domain on the server might be incorrect? I just have no idea and need to have the domains restored URGENTLY - the websites hosted on this server are the whole livelihood of my clients and I definitely can't afford for them to be unreachable.
This is obviously an URGENT project that will need to be started immediately and completed absolutely as soon as possible, preferably in less than 24 hours.