First post on Geekzone, and hoping to help some folks out that may be having Firmware problems with Linksys modems, Specifically X-series models (X2000 and X3000).
I got my internet connected yesterday and while I was in the process of setting everything up, I thought it would be a good idea to upgrade the Firmware on my Cisco Linksys X2000 router, as the current version was quite dated. I jumped on the Cisco site and tracked down the latest version, which is version 2.0.04 (Annex A). The initial setup and Firmware installation went smooth, however, after surfing the net a bit, it soon became apparent that there were a few Login issues on a couple of site (eg. Facebook) and connection speeds felt very sluggish.
Anyway, after a good few hours of fine tuning and research, I found that a few people are having problems with the new Firmware that Linksys released, some more than others. The work around that was suggested, was to "allow" cookies in the router. As one person explained; "Under Security/Firewall in the X2000, I had to _CHECK_ the cookies field for my PC to work with sites like google, amazon, linkedin, and others" . The buggy Firmware however was still, well, bugging me, so I kept on searching for a better solution.
Long story short, I email a very helpful guy somewhere in America who had the previous version of Firmware, which he was kind enough to send to me (still a newer version than what was on the router - version 2.0.03), and the router is LOADS better now. (you can PM me for the previous version).
Not to badmouth the company, but reading up about this whole thing; it definitively sounds like Linksys dropped the ball on this one, releasing Firmware that caused issues easily detected through basic testing, or so it seems. Hopefully they are working on a new Firmware version at the moment which will fix all this.
So for anyone who are having troubles with the Linksys X-series router Firmware, here are two Solutions:
1: Open a browser and go to the router address (192.168.1.1) and check the Cookie setting in the router. (Under the Security tab)
2: Downgrade the Firmware to version 2.0.03. Now, this is a bit more tricky as I couldn't find a previous version anywhere and Linksys apparently don't support the older Firmware, hence the reason why it's not available on the website. So if you would like the previous version, please PM me and I can email the attachment to you.
As I said, Linksys are probably working on a new version, so if you haven't upgraded your Firmware, best to wait for a little while longer :)
Hope this helps!