The telnet port 3658 is used by process

前言

是否在本地使用Arthas的时候，遇到The telnet port 3658 is used by process 34725 instead of target process 44848, you will connect to an unexpected process的异常，其实解决方法很简单。

服务查询

这个一般出现在远程到服务器上之后，没有正常退出Arthas监听进程，然后远程ssh过期了，需要重新登录服务器，然后再次选择与上一次不同的进程之后就会出现这个错误。

选择进程2[44848]以后，复现异常

duansg@DuansiguodeMacBook-Pro ~ % java -jar ~/.arthas-boot.jar
[INFO] JAVA_HOME: /Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home
[INFO] arthas-boot version: 3.6.7
[INFO] Process 34725 already using port 3658
[INFO] Process 34725 already using port 8563
[INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
* [1]: 34725
  [2]: 44848 cn.gov.zcy.service.item.dump.backdoor.ItemDumpBackDoorTest
  [3]: 44847 org.jetbrains.jps.cmdline.Launcher
2
[ERROR] The telnet port 3658 is used by process 34725 instead of target process 44848, you will connect to an unexpected process.
[ERROR] 1. Try to restart arthas-boot, select process 34725, shutdown it first with running the 'stop' command.
[ERROR] 2. Or try to stop the existing arthas instance: java -jar arthas-client.jar 127.0.0.1 3658 -c "stop"
[ERROR] 3. Or try to use different telnet port, for example: java -jar arthas-boot.jar --telnet-port 9998 --http-port -1

上文其实已经提示你了，Try to restart arthas-boot, select process 34725, shutdown it first with running the 'stop' command.

解决

重新选择进程为34725的，发现正常执行。

duansg@DuansiguodeMacBook-Pro ~ % java -jar ~/.arthas-boot.jar
[INFO] JAVA_HOME: /Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home
[INFO] arthas-boot version: 3.6.7
[INFO] Process 34725 already using port 3658
[INFO] Process 34725 already using port 8563
[INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
* [1]: 34725
  [2]: 44848 cn.gov.zcy.service.item.dump.backdoor.ItemDumpBackDoorTest
  [3]: 44847 org.jetbrains.jps.cmdline.Launcher
1
[INFO] arthas home: /Users/duansg/.arthas/lib/3.6.7/arthas
[INFO] The target process already listen port 3658, skip attach.
[INFO] arthas-client connect 127.0.0.1 3658
  ,---.  ,------. ,--------.,--.  ,--.  ,---.   ,---.
 /  O  \ |  .--. ''--.  .--'|  '--'  | /  O  \ '   .-'
|  .-.  ||  '--'.'   |  |   |  .--.  ||  .-.  |`.  `-.
|  | |  ||  |\  \    |  |   |  |  |  ||  | |  |.-'    |
`--' `--'`--' '--'   `--'   `--'  `--'`--' `--'`-----'

wiki       https://arthas.aliyun.com/doc
tutorials  https://arthas.aliyun.com/doc/arthas-tutorials.html
version    3.6.7
main_class
pid        34725
time       2022-11-27 15:17:54

stop

// 执行stop命令
[arthas@34725]$ stop

再次选择进程为44848的

duansg@DuansiguodeMacBook-Pro ~ % java -jar ~/.arthas-boot.jar
[INFO] JAVA_HOME: /Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home
[INFO] arthas-boot version: 3.6.7
[INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
* [1]: 44848 cn.gov.zcy.service.item.dump.backdoor.ItemDumpBackDoorTest
  [2]: 34725
  [3]: 44847 org.jetbrains.jps.cmdline.Launcher
1
[INFO] arthas home: /Users/duansg/.arthas/lib/3.6.7/arthas
[INFO] Try to attach process 44848
Picked up JAVA_TOOL_OPTIONS:
[WARN] Current VM java version: 11 do not match target VM java version: 1.8, attach may fail.
[WARN] Target VM JAVA_HOME is /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home/jre, arthas-boot JAVA_HOME is /Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home, try to set the same JAVA_HOME.
com.sun.tools.attach.AgentLoadException: 0
    at jdk.attach/sun.tools.attach.HotSpotVirtualMachine.loadAgentLibrary(HotSpotVirtualMachine.java:108)
    at jdk.attach/sun.tools.attach.HotSpotVirtualMachine.loadAgentLibrary(HotSpotVirtualMachine.java:119)
    at jdk.attach/sun.tools.attach.HotSpotVirtualMachine.loadAgent(HotSpotVirtualMachine.java:147)
    at com.taobao.arthas.core.Arthas.attachAgent(Arthas.java:122)
    at com.taobao.arthas.core.Arthas.<init>(Arthas.java:27)
    at com.taobao.arthas.core.Arthas.main(Arthas.java:161)
[WARN] It seems to use the higher version of JDK to attach the lower version of JDK.
[WARN] This error message can be ignored, the attach may have been successful, and it will still try to connect.
[INFO] Attach process 44848 success.
[INFO] arthas-client connect 127.0.0.1 3658
  ,---.  ,------. ,--------.,--.  ,--.  ,---.   ,---.
 /  O  \ |  .--. ''--.  .--'|  '--'  | /  O  \ '   .-'
|  .-.  ||  '--'.'   |  |   |  .--.  ||  .-.  |`.  `-.
|  | |  ||  |\  \    |  |   |  |  |  ||  | |  |.-'    |
`--' `--'`--' '--'   `--'   `--'  `--'`--' `--'`-----'

wiki       https://arthas.aliyun.com/doc
tutorials  https://arthas.aliyun.com/doc/arthas-tutorials.html
version    3.6.7
main_class cn.gov.zcy.service.item.dump.backdoor.ItemDumpBackDoorTest
pid        44848
time       2022-11-28 00:31:27

[arthas@44848]$