转 Cannot assign requested address出现的原因及解决方案
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客户端（linux服务器）jmeter压测服务端，出现Cannot assign requested address错误
网上找了下原因，大致上是由于客户端频繁的连服务器，由于每次连接都在很短的时间内结束，导致很多的TIME_WAIT，以至于用光了可用的端 口号，所以新的连接没办法绑定端口，即“Cannot assign requested address”。是客户端的问题不是服务器端的问题。通过netstat，的确看到很多TIME_WAIT状态的连接。
client端频繁建立连接，而端口释放较慢，导致建立新连接时无可用端口
netstat -a|grep TIME_WAIT
tcp 0 0 e100069210180.zmf:49477 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49481 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49469 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49505 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49547 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49513 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49543 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49571 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49488 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49582 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49476 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49462 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49561 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49259 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49371 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49455 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49572 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49509 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49546 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49539 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49468 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49496 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49313 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49479 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49486 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49452 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49500 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49447 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49580 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49565 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49454 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49499 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49494 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49591 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49566 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49557 e100069202104.zmf.tbs:websm TIME_WAIT
tcp 0 0 e100069210180.zmf:49495 e100069202104.zmf.tbs:websm TIME_WAIT
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原文链接：https://blog.csdn.net/fzhqcjc/article/details/84924724
解决办法
执行命令修改如下内核参数 （需要root权限）
调低端口释放后的等待时间，默认为60s，修改为15~30s：
sysctl -w net.ipv4.tcp_fin_timeout=30
sysctl -w net.ipv4.tcp_timestamps=1
修改tcp/ip协议配置，快速回收socket资源，默认为0，修改为1：
sysctl -w net.ipv4.tcp_tw_recycle=1
允许端口重用：
sysctl -w net.ipv4.tcp_tw_reuse = 1
（修改tcp/ip协议配置， 通过配置/proc/sys/net/ipv4/tcp_tw_resue, 默认为0，修改为1，释放TIME_WAIT端口给新连接使用）
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