Why are some online forms unable to submit?

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http://askubuntu.com – I've been having a lot of problems regarding networking on my Ubuntu laptop. From Windows, everything works fine. When I wire directly into the modem, it works fine, but when I am on my wireless network (and I've tried wiring into the network as well), I've been having problems with web form, and sometimes site logins. Not all web forms have this problem, but on many, I submit the form, and nothing happens for a minute or two. Then, in Firefox, it says the connection was reset. In Chrome, it says "This web page is not available. The connection to was interrupted. This was all I knew until I (HowTos)