We get the following event error in one of our cleint Exchange Server. Would like to know what the error states & how to fix out. 1, Event id: 1101 | Source : MSExchange POP Service Description: The limit for simultaneous connections has been exceeded. 2, Event id: 1030 | Source : MSExchange POP Service The connection from IP address {172.X.X.X} is being dropped.The rate of connections from this IP address has exceeded the configured limit '2400' per minute. Thanks Pradeep Kumar.S

sounds like you have many users behind a single PAT/NAT device. see if that 2400 value is here: Get-PopSettings -Server $yourcasserver | fl maxcon* if so, maybe setting MaxConnections or MaxConnectionsFromSingleIP higher will help Set-PopSettings -Server "$yourCASserver" -MaxConnectionsFromSingleIP '25000' *note:MaxConnections accepts Int32 but Exchange help says 25000 is max.