与linux服务器上的mongd实例连接不上

可以使用mongo xxx.xxx.xxx.xxx连接上客户端进行操作, 但是进行Balancer时, 错误提示如下:
balancer move failed: { cause: { active: false, ns: "testdb.uniques", from: "shard1/PC-2016huumjn:21001", min: { date: MinKey, dim0: MinKey }, max: { date: "2016-01", dim0: 200000.0 }, shardKeyPattern: { date: 1.0, dim0: 1.0 }, state: "fail", errmsg: "socket exception [CONNECT_ERROR] for shard1/PC-2016huumjn:21001", counts: { cloned: 0, clonedBytes: 0, catchup: 0, steady: 0 }, ok: 1.0 }, code: 96, ok: 0.0, errmsg: "data transfer error" } from: shard1 to: shard0005 chunk: min: { date: MinKey, dim0: MinKey } max: { date: "2016-01", dim0: 200000.0 }
请问这是什么原因，如何解决，求大神帮助。