I assume your server is a gateway... One of the reasons is that it is not configured properly or one or more services have failed require attention of network administrator.
For the internet; your web browser is the client and the web server is the server.
Most applications used on the Internet or a local networkare client/server applications. Client applications, such as Internet Explorer, GoogleChrome, or Outlook, communicate with server applications such as a web server oremail server.
yes
Client/server applications
Receiving software updates from the Internet
Client / Server
a server runs the website though the internet and sends the data to any computer who asks for the web page meanwhile a client is a computer asking for the web page
An IRC Client, or Internet Relay Chat Client, is a program used to connect to an Internet Relay Chat server so that a user can chat via text-based messages in real-time.
Other than the ordinary meaning, SOCKS (SOCKet Secure) is an internet protocol that routes network packets between a client and server through a proxy server.
Router is usually configured as a DHCP client for WAN (Internet) network and as a DHCP server for local network.
Pretty much a client server network is known as a client server network.
Internet programming is generally a client/server based programming where there will be servers for handling requests and clients for sending request these may be on different computers but the other programing may or may not be client server based which is on the same PC