ftp连接数量过多

最新推荐文章于 2025-07-15 17:07:03 发布

与君灬共勉

最新推荐文章于 2025-07-15 17:07:03 发布

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一、现象描述

通过ftp客户端代码登录ftp服务器向指定目录发布文件，发生FTPException异常，消息提示“Maximum login limit has been reached”，详情如下：

 
      _, ftpserver0_.CREATE_TIME as CREATE8_12_0_, ftpserver0_.UPDATE_TIME as UPDATE9_
     
      12_0_, ftpserver0_.STATUS as STATUS12_0_, ftpserver0_.VIRTUAL_DIR as VIRTUAL11_1
     
      2_0_ from FTPSERVER ftpserver0_ where ftpserver0_.ID=?
     
      [INFO ][
      2015
      -
      12
      -
      20 
      21
      :
      56
      :
      26
      ][com.xwood.pms.core.ftp.IssFTPClient.login(IssFTPClien
     
      t.java:
      74
      )]:建立连接
     
      it.sauronsoftware.ftp4j.FTPException [code=
      421
      , message= Maximum login limit has
     
      been reached.]
     
      at it.sauronsoftware.ftp4j.FTPClient.login(FTPClient.java:
      1242
      )
     
      at it.sauronsoftware.ftp4j.FTPClient.login(FTPClient.java:
      1168
      )
     
      at com.xwood.pms.core.ftp.IssFTPClient.login(IssFTPClient.java:
      82
      )
     
      at com.xwood.pms.util.publisher.FtpOms.upload(FtpOms.java:
      171
      )
     
      at com.xwood.pms.util.publisher.FtpOms.upload(FtpOms.java:
      144
      )
     
      at com.xwood.pms.service.impl.FilePublisher.createAndPublishWithMultiPorta
     
      ls(FilePublisher.java:
      306
      )
     
      at com.xwood.pms.util.publisher.PublishRunnable.call(PublishRunnable.java:
     
      59
      )
     
      at com.xwood.pms.util.publisher.PublishRunnable.call(PublishRunnable.java:
     
      1
      )
     
      at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
     
      at java.util.concurrent.FutureTask.run(Unknown Source)
     
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source
     
      )
     
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
     
      at java.lang.Thread.run(Unknown Source)
     
      [INFO ][
      2015
      -
      12
      -
      20 
      21
      :
      56
      :
      26
      ][com.xwood.pms.core.ftp.IssFTPClient.login(IssFTPClien
     
      t.java:
      87
      )]:登录FTP服务器失败！Maximum login limit has been reached.
     
      java.lang.IllegalStateException: Client not authenticated
     
      at it.sauronsoftware.ftp4j.FTPClient.changeDirectory(FTPClient.java:
      1610
     
      )
     
      at com.xwood.pms.core.ftp.IssFTPClient.changeDirectory(IssFTPClient.java:
      2
     
      04
      )
     
      at com.xwood.pms.util.publisher.FtpOms.upload(FtpOms.java:
      172
      )
     
      at com.xwood.pms.util.publisher.FtpOms.upload(FtpOms.java:
      144
      )
     
      at com.xwood.pms.service.impl.FilePublisher.createAndPublishWithMultiPorta
     
      ls(FilePublisher.java:
      306
      )
     
      at com.xwood.pms.util.publisher.PublishRunnable.call(PublishRunnable.java:
     
      59
      )
     
      at com.xwood.pms.util.publisher.PublishRunnable.call(PublishRunnable.java:
     
      1
      )
     
      at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
     
      at java.util.concurrent.FutureTask.run(Unknown Source)
     
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source
     
      )
     
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
     
      at java.lang.Thread.run(Unknown Source)
     
      com.xwood.pms.core.freemarker.exception.FtpException: ftp异常！file:/_site_domain_
     
      /_root/
      5870
      /
      5930
      /
      5931
      /
      6189
      /
      6515
      //E:/SaaServices/tomcat6-exe/webapps/ROOT/_root/5
     
      870
      /
      5930
      /
      5931
      /
      6189
      /
      6515
      /index.htmlClient not authenticated
     
      at com.xwood.pms.util.publisher.FtpOms.upload(FtpOms.java:
      188
      )
     
      at com.xwood.pms.util.publisher.FtpOms.upload(FtpOms.java:
      144
      )
     
      at com.xwood.pms.service.impl.FilePublisher.createAndPublishWithMultiPorta
     
      ls(FilePublisher.java:
      306
      )

二、解决步骤

1. 从FTPException异常消息很明显，是因ftp客户端登陆数超上限造成的，所以需将ftp服务器的登录数限制配置参数调大

2. 这边是用的 apache-ftpserver-1.0.6 （如是其他服务器如vsftpd、ServU请修改其配置），启动命令是通过ftpd-typical.xml的xml配置参数进行初始化ftpserver对象

报FTPException:"code=421, message= Maximum login limit has been reached"错误

3. 通过ftp默认启动,定位根目录common -> lib -> f tpserver-core-1.0.6.jar包文件

报FTPException:"code=421, message= Maximum login limit has been reached"错误

4. 通过源码查找最大登录数相关配置文件及属性（max-logins最大登录数），找到如下图所示

报FTPException:"code=421, message= Maximum login limit has been reached"错误

5. 找到ftpd-typical.xml初始化配置文件，配置了如下箭头所示属性（max-logins="999999"）

报FTPException:"code=421, message= Maximum login limit has been reached"错误

 
      <
      server 
      xmlns
      =
      "http://mina.apache.org/ftpserver/spring/v1"
     
 
          
      xmlns:xsi
      =
      "http://www.w3.org/2001/XMLSchema-instance"
     
 
          
      xsi:schemaLocation="
     
 
             
      http://mina.apache.org/ftpserver/spring/v1 http://mina.apache.org/ftpserver/ftpserver-1.0.xsd    
     
 
             
      "
     
 
          
      id
      =
      "myServer" 
      max-logins
      =
      "999999"  
      max-threads
      =
      "9999"
      >
     
 
          
      <
      listeners
      >
     
 
              
      <
      nio-listener 
      name
      =
      "default" 
      port
      =
      "21"
      >
     
 
                  
      <
      ssl
      >
     
 
                      
      <
      keystore 
      file
      =
      "./res/ftpserver.jks" 
      password
      =
      "password" 
      />
     
 
                  
      </
      ssl
      >
     
 
              
      </
      nio-listener
      >
     
 
          
      </
      listeners
      >
     
 
          
      <
      file-user-manager 
      file
      =
      "./res/conf/users.properties" 
      encrypt-passwords = "clear" />
     
 
      </
      server
      >
     

6. 重启服务，一切正常