If you just went through this post of ours and downloaded Absinthe, just to get stuck with an error Fix Error Establishing a database connection while installing it on you system, then don’t panic – just give it a while. Its probably due to the limit in the number of connections that are being concurrently established with the Absinthe database. Here’s how to fix the error..
To fix this error:-
Go to Settings -> General ->Network and turn on VPN on your iPhone 4S or iPad 2.
Your iPhone/iPad will now reboot after getting an error – getting an error at this stage is normal.
After the reboot, relaunch Absinthe and things should be just fine this time.
Reboot once again and your iPhone 4S / iPad 2 will be jailbroken.