Poll: How do you keep remote users out in emergency?

Our last poll asked readers of this blog the question:

Which Webserver do you use?

Thanks to everyone, total 435 people responded to the poll. Results are as follows:

66% users are using Apache v2.2.x web server
11% uses are using Apache v1.3x web server
8% users are using Microsoft IIS v5/6 web server
6% users are using lighttpd web server

I guess apache rules when it comes to Web server.

New poll: How do you keep remote users out in emergency?

Last week I had some problem with 3 servers. Since I was patching system and backing up stuff I wanted to keep my remote user out for at least for 60-90 minutes. As usual I dropped the remote connections using /etc/nologin and turning off both ftpd/sshd.

Now I am wondering -- how you guys keep remote users out in emergency? Let me know if you are using some other nifty technique.