在假日兩天，server的log，出現一堆訊息，

Aug 16 10:32:26 ns1 named[580]: client 68.87.64.148#22604: error sending response: not enough free resources
Aug 16 10:32:27 ns1 named[580]: client 68.87.64.148#48489: error sending response: not enough free resources
Aug 16 10:32:32 ns1 named[580]: client 168.95.192.99#52347: error sending response: not enough free resources
Aug 16 10:32:33 ns1 named[580]: client 168.95.192.138#33670: error sending response: not enough free resources
Aug 16 10:32:33 ns1 named[580]: client 212.145.12.4#43419: error sending response: not enough free resources
Aug 16 10:32:35 ns1 named[580]: client 61.220.4.53#34036: error sending response: not enough free resources
Aug 16 10:32:37 ns1 named[580]: client 212.145.12.4#43419: error sending response: not enough free resources
Aug 16 10:32:38 ns1 named[580]: client 61.220.4.42#34091: error sending response: not enough free resources
Aug 16 10:32:38 ns1 named[580]: client 212.145.12.4#43419: error sending response: not enough free resources
Aug 16 10:32:38 ns1 named[580]: client 212.145.12.4#43419: error sending response: not enough free resources
Aug 16 10:32:42 ns1 named[580]: client 168.95.192.81#33596: error sending response: not enough free resources
Aug 16 10:32:42 ns1 named[580]: client 212.145.12.4#43419: error sending response: not enough free resources

完完全全出現兩天，並且server上的服務完全掛點，外部ping主機，也ping不到，
請問有沒有那位大大。知道是發生什麼事了，是有人掛BT嗎??