The Fourth Server Downtime is a major outage of the Unterganger Minecraft Server that started late September 2015 and ended early October 2015.
An incident on another server caused a disgruntled player to DDoS the server, which caused every server on the section of the host to crash, including the UMS. The host has since been trying to stop the attack on the server. The company was able to stop the attack for 10 hours on October 2, 2015, but another attack was soon placed, once again crippling the servers. The host has since promised to pay RDPIsOnCrack back the amount of money that was wasted during the outage.