From here on anyone that gets this message above in the header (Second Life cannot be accessed from this computer) as a login response should not come on to these forums seeking help as it is beyond us.
This situation
can occur to due errors in SL but it
mainly happens because
you have been banned (IP/machine or account) from SL for some reason. You need to contact Linden Labs and resolve the issue if you think it is an error.
To avoid being in this situation follow the below guidelines:
1. Do not use older versions of METAbolt that are not TPV compliant. Any version lower than 0.9.19 is non TPV compliant
2. Do not use METAbolt to inflate your land traffic numbers. If you need to have several avatars on the same land, register them as bots
3. Observe the SL TOS at all times
You need to contact Linden Labs to resolve this issue. Look here for more information on this subject:
http://wiki.secondlife.com/wiki/Linden_Lab_Official:Why_does_Second_Life_say_%22You_cannot_log_into_Second_Life_from_this_location%22Thx