Tarpitting describes a defensive technique used to defend servers under attack.

WanderWare implements a form of tarpitting to conserve resources if it recognises a series of connections as being incorrect. In these circumstances, suspect connections are simply dropped without reply. This serves to dramatically reduce the speed and effectiveness of the attack because the attacker(s) must wait for network replies which will never arrive. This serves to conserve both bandwidth and system resources for legitimate connections ...

Sites are insulated from the effects of browser upgrades and patches because the authentication and authorisation are standards compliant and the results are not dependent on browser interaction ...