Is it possible to find out what operating systems are running on remote web server?

You can do it through remote access software which will give you the access right to the remote server. For this approach, you have to install the remote access software in the remote computer, and you will be able to access it from your computer. You will need TeamViewer Pro software for accessing the remote computer. First, you have to install this software in the remote computer and ask the computer user to send you the password and log ID. So, that you will have to send your computer Log ID to the remote user for giving the permission to access the remote computer. Therefore, now you should not have any problem to access the name of the operating system in the remote computer. Now, you may go to the system tab and get the operating system name of the remote computer. Moreover, if you need to know the details about the operating system, then you may install Speecy software from Piriform website in the remote computer. Therefore, you will get the details about the remote computer. The remote access of any computer is very much useful for any computer emergency. So, you may solve your computer problems from the remote access.