Thanks for your quick reply, however this is not a matter due to firewall. Let's review the factors concerning this problem.
1) My sister is able to login her account on my same computer, same system, same network.
2) We do not have a hardware firewall installed.
3) All software firewalls have been disabled including microsoft's windows xp firewall.
4) This obviously has nothing to do with my network when my sister is able to login secondlife, while i can't.
5) I was able to login 3 days ago, until after the server reboot with some administrator logging me off due to some server attack by god knows who sending me various objects naming " 000040320.043204032".
6) No settings have been changed ever since.
7) I've been using SecondLife service for the past few months with no problems until these few days.

We're not behind a router.
9) We're not on a wireless connection.
10) We're just connected straight to a broadband modem with 2MBPS through a Lan Cable.
11) I am able to login my account on the SecondLife HTTP main website.
Steps i have followed from 3 lindens online to solve this problem.
1) Uninstall Secondlife, download latest secondlife client, and install.
2) Login to another simulator by changing login location.
3) Login in from another system, from another network connection.
4) Login to SecondLife using the SLURL link.
5) Delete SecondLife Cache. and Relogin.
6) Delete the whole SecondLife folder in the Documents and Settings\Applications folder.
7) Turned off all firewalls, and reboot to login.

Changed account password, and login new password.
9) Changed account email address, and login.
So, obviously, this has NOTHING to do with my network, my disabled firewall, or my non-existant security suite. I'm thinking is probably the administrators from SECONDLIFE have MESSED UP my account and has NO IDEA. I personally do not like investing on an account only to find it disabled and not able to recover. Please do something about this. Your help is appreciative, but firewalls isn't the answer. Nor any security softwares. So please, help check on the status of my account, before making any hasty replies.
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Greetings,
Thanks for your inquiry.
Firewalls and internet security software are designed to block network
traffic! Hardware firewalls, such as routers, are typically configured
to block data coming from specific network "ports" (except commonly
used ones like web pages and instant messengers); this includes most
network ports Second Life uses.
Internet Security software also blocks network traffic; however, these
programs can cause a great deal of trouble if not configured
correctly. Some versions of Internet Security software, in many
popular configurations, block any non-web-browser program, often fail
to notify the user of their actions, and may even block previously-
listed "trusted" programs if network traffic changes, or if the
executable changes (such as when a new version of Second Life is
released).
If your login to Second Life fails at Verifying Protocol Version, or
cannot find the server, or if you disconnect from Second Life
automatically every few minutes, a firewall is typically the cause.
How your configure your home network and secure your computers is, of
course, your own decision. However, Linden cannot provide support for
configurations where a firewall or internet security software is
interfering with Second Life's network access. These setups need to be
configured properly for Second Life.
Hardware firewalls need to allow access on certain network ports.
Second Life needs to connect to ports 443/TCP, 12035/UDP, 12036/UDP,
and 13000-13050/UDP. You should configure your firewall to allow
outbound traffic on those ports, and related inbound traffic. You'll
need to consult your firewall's documentation, or the manufacturer's
website, for instructions on how to make these changes to your
firewall.
Software firewalls should have Second Life listed as a "trusted"
program. Linden highly recommends turning on any notification for
blocked network activity. This software should also be frequently
monitored, as some versions change their own settings in an attempt to
provide tighter security. You will need to consult the documentation
for the software, or go to the manufacturer's website, for details on
how to configure your internet security software. (Linden cannot
provide support for third-party software).
Don't forget the built-in Windows Firewall; certain system updates may
cause the Windows Firewall to re-enable itself. You can find the
Windows Firewall in the Control Panel.
If you're using wireless networking, it may not provide a stable and
fast enough connection for Second Life.
Regards,
Martin Linden
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Can't log in my character