dubbo 异常

报错日志:
AbstractClient:112 -  [DUBBO] Failed to start NettyClient iZ25p1lbijbZ/ip connect to the server /ip:38136 (check == false, ignore and retry later!), cause: client(url: dubbo://ip:38136/com.cmall.apimerch.rpc.OAuthDubboService?anyhost=true&application=support&check=false&codec=dubbo&default.check=false&default.timeout=15000&dubbo=2.5.3&heartbeat=60000&interface=com.cmall.apimerch.rpc.OAuthDubboService&methods=getExpireIn,addAccessToken,getUser,checkClientId,addAuthCode,getCodeByAccessToken,addUnionAuthCode,checkAuthCode,getUserSupCode,getUsernameByAuthCode,checkAccessToken,getUsernameByAccessToken,checkClientSecret&pid=22668&revision=1.0.2-SNAPSHOT&serverApplicationName=apiMerchService&side=consumer&timestamp=1499768230308&version=1.0.0) failed to connect to server /ip:38136, error message is:拒绝连接, dubbo version: 2.5.3, current host: ip
com.alibaba.dubbo.remoting.RemotingException: client(url: dubbo://ip:38136/com.cmall.apimerch.rpc.OAuthDubboService?anyhost=true&application=support&check=false&codec=dubbo&default.check=false&default.timeout=15000&dubbo=2.5.3&heartbeat=60000&interface=com.cmall.apimerch.rpc.OAuthDubboService&methods=getExpireIn,addAccessToken,getUser,checkClientId,addAuthCode,getCodeByAccessToken,addUnionAuthCode,checkAuthCode,getUserSupCode,getUsernameByAuthCode,checkAccessToken,getUsernameByAccessToken,checkClientSecret&pid=22668&revision=1.0.2-SNAPSHOT&serverApplicationName=apiMerchService&side=consumer&timestamp=1499768230308&version=1.0.0) failed to connect to server /ip:38136, error message is:拒绝连接
at com.alibaba.dubbo.remoting.transport.netty.NettyClient.doConnect(NettyClient.java:124)
at com.alibaba.dubbo.remoting.transport.AbstractClient.connect(AbstractClient.java:280)
at com.alibaba.dubbo.remoting.transport.AbstractClient.<init>(AbstractClient.java:103)
at com.alibaba.dubbo.remoting.transport.netty.NettyClient.<init>(NettyClient.java:61)
at com.alibaba.dubbo.remoting.transport.netty.NettyTransporter.connect(NettyTransporter.java:37)
at com.alibaba.dubbo.remoting.Transporter$Adpative.connect(Transporter$Adpative.java)
at com.alibaba.dubbo.remoting.Transporters.connect(Transporters.java:67)
at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchanger.connect(HeaderExchanger.java:37)
at com.alibaba.dubbo.remoting.exchange.Exchangers.connect(Exchangers.java:102)
at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol.initClient(DubboProtocol.java:378)
at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol.getSharedClient(DubboProtocol.java:344)

dubbo 默认线程池大小200

并发量过大时会报