Unable to open debugger port in IntelliJ IDEA

Question

I have a problem that I can not set up my application in debug mode with IntelliJ IDE  but run mode is OK   My OS is Windows 7  IDE is IntelliJ IDEA  web container is Tomcat 6  I have tried for a long time   changed the HTTP port and the JMX port  but it did not work    When I set up the app in debug mode with IntelliJ  it failed and the event log is      16 05 35 Error running tomcat  Unable to open debugger port     java net BindException  Address already in use  JVM Bind

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I have the same issue because my computer s DNS miss 127 0 0 1  localhost  When I add 127 0 0 1  localhost to my host file it become ok

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In my case I had another project open in IntelliJ  and had Tomcat running in debug mode in that project  Stopping that instance of Tomcat resolved the issue

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There are various reasons for this  - There might be the problem with debugger port---Please change it to resolve  answered by T M   - There might be some issue with intellij cache --Invalidate cache and restart will solve it   answered by feng smith   - There might be problem with any other Port  like JMX  AJP --- Please change these port numbers as well  I wanted to add this as comment but not enough rep

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Running IntelliJ as Administrator in Windows did the magic for me

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Check  Run  configuration to see which port it is using  8081     Find all the other processes using that port lsof -t -i  8081   Kill the processes on that port  kill PROCESS ID Run Tomcat in Debug mode    In my case  I wasted so much time on changing debugger port but it was not the issue  Since tomcat was not able to run on the port I chose in Run configuration  I was not able to debug my service

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This works for me consistently  it happens to me from time to time  when I do things such a restart tomcat when I am running the integration tests  for example   1  Find the process that has the port 1099 open  sudo netstat -anp   grep tcp   grep 1099 cp6       0      0    1099                                         LISTEN      9857 java   2  kill it  kill 9857   3  Start Tomcat

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I had this exact message   The reason was that some IDE  I use Eclipse and Intellij  failed to shutdown the tomcat server   Or maybe crashed before it could do so   The solution was to navigate to C      apache-tomcat-xxx bin and run shutdown

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Just restart the Android studio before try these all  I face same right now and i fix it by this way  Happy coding

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My assumption that this exception usually occurs when Tomcat is improperly closed and still holding the ports  Usually it is enough to kill any process listening to 1099 port  For Window 10   netstat -aon   find  1099    taskkill  F  PID  processId

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I had same issue in windows 7 and IntellijIdea 14  I killed the java processes by going CTRL ALT ESc  find java and kill it  Now Re-Run  the application again it should be fine   You can also do it with command line or shell linux   but I found this easier for myself

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In Server tab of Tomcat configuration in IntelliJ  change JMX port to another number

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The only thing that worked for me is to go to Task Manager on Windows  and end all the Java processes that is running by right click -  end Task

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Probably you get the same error message if the standalone xml in your standalone configuration folder cannot be found  At least I have the same error when using a WildFly 14 0 1

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For me  IntelliJ Event Log  right bottom corner  had below logs    Error running EntitmentTooling-Debug  Cannot run program   path-to apache-tomcat-8 5 15 bin catalina sh   in directory  path-to apache-tomcat-8 5 15 bin    error 13  Permission denied  Error running EntitmentTooling-Debug  Unable to open debugger port  127 0 0 1 58804   java net SocketException  Socket closed    The command    chmod a x  path-to apache-tomcat-8 5 15 bin catalina sh   to sufficiently change privileges worked for me

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While debug I got this issue  It worked with     tried changing my Tomcat http port 8082 to 8083 In debug configurations on IntelliJ and in Tomcat- conf- server xml also  tried changing JMX port from 1099 to 1009  tried changing debug port in Startup Connection in debug     configurations killed all java processes in TaskManager- Processes

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I came in this scenario and as the above answers I tried to change the port like Edit Configuration - gt  Startup Connection - gt  debug - gt  change the Port but it didn t solve my problem cause I was running my application in debug mode so once try to run the application as normal without debug  it solved my problem

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In my case  there was a problem in server xml for Tomcat conf folder where I had extra comment tags under another comment tag  So I think  since there was some problem in server xml  it was not able to start Tomcat  And moreover it copies the tomcat folder from your installation directory to C  Users username IntelliJIdea2017 2 system tomcat Tomcat service

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All the other solutions unfortunately did not work  This is what worked for me   I simply changed the debugger port to some other port number   Intelij-  preferences- Build  execution  deployment - Debugger-  Built in server- port change value

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There are multiple solution for the same     Either we may close the IDE  e g  IntellJ   Find t IND00123 bin devbratanand  lsof -i 30303 COMMAND PID         USER   FD   TYPE             DEVICE SIZE OFF NODE NAME idea    437 devbratanand   56u  IPv4 0xb2720e580a7d6483      0t0  TCP 10 17 130 41 55222- vmqp-cms-pan-app1 emea akqa local 30303  ESTABLISHED  IND00123 bin devbratanand  kill -9 437

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the key to the issue is in debugger port  I was having the same problem  I was killing every process listening on port 8081  my http port   1099  JMX port   tomcat shutdown port  every java exe  and still nothing   The thing is this debugger port is different  If you run the application  it will go through the port you have Tomcat configured for  8080  8081 or whatever  But if you run it in Debug mode  it goes through a different port    If you go edit your Tomcat configuration from IntelliJ  the last tab is Startup Connection  Here go see the configuration for Debug mode  and you ll see its port  Mine was 50473  I changed it to 50472  and everything started working again

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None of above methods worked in my case i e  changing port number in run configuration  machine restart  invalidate cache in IntelliJ  killing process shown in netstat  nestat -anob   findstr  lt port-number gt  and then tskill  lt pid gt    The only thing that finally helped was starting and shutting down tomcat manually via startup bat and shutdown bat  you should use correspondig  sh files on linux and macOS

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For anyone who comes here with the similar message  Unable to open debugger port  127 0 0 1 50470       java net SocketException  quot Interrupted function call  accept failed quot   This may be caused by something completely independent  i e  it s not a port configuration  If you re running Tomcat  for instance  it may be that you have an invalid web xml  Check your Event Log for any previous errors  Cannot load C      conf web xml  ParseError at  row col   480 29              Message  The element type  quot param-value quot  must be terminated by the matching end-tag  quot  lt  param-value gt  quot

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I solved the issue by this way    I tried to kill all the java exe processes but it was useless  Then I tried deleting the Tomcat server  I re-deployed the project and restarted the project and it worked    See these links for more information   Delete Tomcat   Add a new Tomcat

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It happens occasionally that when I restart my computer  everything is OK  Perhaps there is a port conflict   Restart the computer works because instances of Java or Tomcat are killed during the restart  You can also consider killing the specific processes from Task Manager  This also happens if there is an issue in the context xml file  In my case  I had accidentally changed the context value

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This happens when you have application running on the same port number  One way to do this by killing the process forcefully  Open command prompt as an admin  Run command  taskkill  IM  java exe   F   This worked for me in Windows  Let me know if this works

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try chmod a x  path to tomcat bin catalina sh if you run it in intelliJ

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Change debug port of your server configured in the Intelli J   It will be fixed

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I have encountered the same error while using IntelliJ  Since I have started multiple instances of IntelliJ  While starting two instance it started properly  However  when starting another one  it was giving below error  unable to open debugger port  127 0 0 1 debug-port-number  java net socketexception interrupted function call accept failed  There are basically two places you can check your ports related to debugging in IntelliJ  JMX port - you can find this is  In Startup Configuration  there is debug option just click this    What to Check  If IntelliJ is throwing above error  means issue is any of the above listed ports  To verify this open event log  its available in right corner down  and check the exact message  Event log will have message like below 11 19 PM    Error running  Tomcat-tp   Address localhost 1098 is already in use  11 19 PM    Error running  Tomcat-tp   Unable to open debugger port  127 0 0 1 51787   java net SocketException  quot Interrupted function call  accept failed quot   Solution-1 Check the JMX port of current intelliJ which is not starting with the working one and  verify if JMX ports are not duplicated within IntelliJ instance or any of the software which is running in your machine is not using this port  Solution-2 If JMX is not duplicated then verify your debug port  check in all IntelliJ instance and do the changes  Surely either JMX or Debug port is having issue just use unique JMX and Debug port and it will work  Hope this will help someone

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If you re on windows you can bypass the socket issue completely by switching to shared memory debugging

[intellij-idea] Unable to open debugger port in IntelliJ IDEA

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