jmeter报错:failed:connection timed out :connect/java.net.BindException: Address already in use: connect
java.net.BindException: Address already in use: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl$JMeterDefaultHttpClientConnectionOperator.connect(HTTPHC4Impl.java:401)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:376)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:930)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:641)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:66)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1281)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1270)
at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:630)
at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:558)
在性能测试的是遇到以上报错的意思是，连接超时、地址已占用
原因：发起方，端口数量不足，导致请求失败
方法：
win10：
\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
新建2个，DWORD 32值，值为十进制
MaxUserProt：65535,10进制
TcpTimedWaitDelay：30,10进制
重启
linux：
sysctl -w net.ipv4.ip_local_port_range="1024 65535" #大约有6.4w个端口
sysctl -w net.ipv4.tcp_tw_reuse = 1 # 表示开启重用，允许将TIME-WAITsockets重
sysctl -w net.ipv4.tcp_tw_recycle = 1 # 表示开启TCP连接中TIME-WAITsockets的快速
sysctl -w net.ipv4.tcp_fin_timeout = 5 # 修改系统默认的TIMEOUT时间为5秒；调小
sysctl -w net.ipv4.tcp_max_syn_backlog = 8192 # 进入syn包的最大请求队列；调大
sysctl -w net.ipv4.tcp_max_tw_buckets = 5000 # 表示系统同时保持TIME_WAIT套接字文章来源：https://www.toymoban.com/news/detail-411273.html
sysctl -p # 配置生效文章来源地址https://www.toymoban.com/news/detail-411273.html
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