Networking :: Wget Can Access / Browser Cannot

I have been having a problem on my Ubuntu desktop with the wireless connection. I am now running Ubuntu 10.04, but the problem showed up immediately after upgrading to Ubuntu 9.10. This machine is used as a CUPS server so my wife can print from her laptop and get to a printer downstairs. Intermittently, I will be unable to access the CUPS server web pages (or any other web pages on the local Apache server) from a remote machine on the internal network. I also cannot connect in via SSH. However, from the wireless desktop itself the web pages are still accessible and a local browser can also access remote web sites just fine. So, the network connection is still up.

To try to determine how often this was happening, I wrote a simple Bash script that checked if a page could be accessed on the web server on the wireless machine. I used wget to access a page and then log the results to a file while running the script from a crontab entry. It turns out that even though I cannot access a web page using a remote browser, I can access the same web pages using wget from a remote machine. This has me a little confused..What could be causing this situation? I do not have a firewall running on the desktop with the wireless connection. After a while, the blockage of inbound web pages from a remote browser is "fixed" and I can again access the CUPS (and other) pages.