I have a standard installation of Ubuntu 10.04, and have installed the LAMP stack so I can do some web development locally. On my router I have opened port 80 so I can develop with external services like paypal and facebook, as they need to see the website for them to work.
How unsecure has my development machine become by opening port 80? Can I secure it further, yet leave port 80 open?
I am asking this quesiton because on my apache error.log file, I noticed an external ip address trying to access webdav, which I do not have setup. I have yet to check the access.log file.