No connection could be made because the target machine actively refused it

Question

Sometimes I get the following error while I was doing HttpWebRequest to a WebService  I copied my code below too      System Net WebException  Unable to connect to the remote server ---  System Net Sockets SocketException  No connection could be made because the target machine actively refused it 127 0 0 1 80    at System Net Sockets Socket DoConnect EndPoint endPointSnapshot  SocketAddress socketAddress     at System Net Sockets Socket InternalConnect EndPoint remoteEP     at System Net ServicePoint ConnectSocketInternal Boolean connectFailure  Socket s4  Socket s6  Socket  socket  IPAddress  address  ConnectSocketState state  IAsyncResult asyncResult  Int32 timeout  Exception  exception     --- End of inner exception stack trace ---    at System Net HttpWebRequest GetRequestStream       ServicePointManager CertificatePolicy   new TrustAllCertificatePolicy    HttpWebRequest request    HttpWebRequest WebRequest Create url    request PreAuthenticate   true  request Credentials   networkCredential sla   request Method   WebRequestMethods Http Post  request ContentType    application x-www-form-urlencoded   request Timeout   v Timeout   1000   if  url IndexOf  asmx    gt  0  amp  amp  parStartIndex  gt  0        AppHelper Logger Append                   sla ServiceName        using  StreamWriter reqWriter   new StreamWriter request GetRequestStream                                           while  true                        int index01   parList Length              int index02   parList IndexOf                    if  parList IndexOf   amp     gt  0                  index01   parList IndexOf   amp                  string parName   parList Substring 0  index02               string parValue   parList Substring index02   1  index01 - index02 - 1                reqWriter Write   0   1    HttpUtility UrlEncode parName   HttpUtility UrlEncode parValue                  if  index01    parList Length                   break                reqWriter Write   amp                  parList   parList Substring index01   1                         else         request ContentLength   0       response    HttpWebResponse request GetResponse

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Normally  connection scripts do not mention the port to use  For example   mysqli   mysqli connect  127 0 0 0 1    user    password    database     So  to connect with a manager that doesn t use port 3306  you have to specify the port number on the connection request   mysqli   mysqli connect  127 0 0 0 1    user    password    database    3307     To check the connections on the MySQL or MariaDB database manager  use the script  wamp 64  www testmysql php by putting  http   localhost testmysql php  in the browser address bar having first modified the script according to your parameters

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I had the same problem  The problem is that I didn t start the selenium server  I have downloaded the selenium server and i started it  After starting the selenium server  issue gone and all worked fine   Refer this   http   coding-issues blogspot in 2012 11 no-connection-could-be-made-because html

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Go to your WCF project - properties -   -  debuggers  -  unmark the checkbox     Enable Edit and Continue

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I ve received this error from referencing services located on a WCFHost from my web tier   What worked for me may not apply to everyone  but I m leaving this answer for those whom it may   The port number for my WCFHost was randomly updated by IIS  I simply had to update the end routes to the svc references in my web config   Problem solved

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I came across this error and took some time to resolve it  In my case I had https and net tcp configured as IIS bindings on same port  Obviously you can t have two things on the same port  I used netstat -ap tcp command to check whether there is something listening on that port  There was none listening  Removing unnecessary binding  https in my case  solved my issue

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I had the same error with my WCF service using Net TCP binding  but resolved after starting the below services in my case   Net Pipe Listener Adapter   Net TCP Listener Adapter   Net Tcp Port Sharing Service

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I was facing this issue today  Mine was Asp Net Core API and it uses Postgresql as the database  We have configured this database as a Docker container  So the first step I did was to check whether I am able to access the database or not  To do that I searched for PgAdmin in the start as I have configured the same  Clicking on the resulted application will redirect you to the http   127 0 0 1 23722 browser   There you can try access your database on the left menu  For me I was getting an error as in the below image     Enter the password and try whether you are able to access it or not  For me it was not working  As it is a Docker container  I decided to restart my Docker desktop  to do that right click on the docker icon in the task bar and click restart    Once after restarting the Docker  I was able to login and see the Database and also the error was gone when I restart the application in Visual Studio    Hope it helps

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In my case  some domains worked  while some did not  Adding a reference to my organization s proxy Url in my web config fixed the issue    lt system net gt       lt defaultProxy useDefaultCredentials  true  gt         lt proxy proxyaddress  http   proxy my-org com   usesystemdefault  True   gt       lt  defaultProxy gt   lt  system net gt

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I would like to share this answer I found because the cause of the problem was not the firewall or the process not listening correctly  it was the code sample provided from Microsoft that I used   https   msdn microsoft com en-us library system net sockets socket 28v vs 110 29 aspx  I implemented this function almost exactly as written  but what happened is I got this error   2016-01-05 12 00 48 075  10  ERROR - The error is  System Net Sockets SocketException  0x80004005   No connection could be made because the target machine actively refused it  fe80  caa 745 a1da e6f1 11  4080  This code would say the socket is connected  but not under the correct IP address actually needed for proper communication   Provided by Microsoft   private static Socket ConnectSocket string server  int port                Socket s   null          IPHostEntry hostEntry   null              Get host related information          hostEntry   Dns GetHostEntry server               Loop through the AddressList to obtain the supported AddressFamily  This is to avoid            an exception that occurs when the host IP Address is not compatible with the address family             typical in the IPv6 case           foreach IPAddress address in hostEntry AddressList                        IPEndPoint ipe   new IPEndPoint address  port               Socket tempSocket                    new Socket ipe AddressFamily  SocketType Stream  ProtocolType Tcp                tempSocket Connect ipe                if tempSocket Connected                                s   tempSocket                  break                            else                               continue                                  return s          I re-wrote the code to just use the first valid IP it finds  I am only concerned with IPV4 using this  but it works with localhost  127 0 0 1  and the actually IP address of you network card  where the example provided by Microsoft failed       private Socket ConnectSocket string server  int port                Socket s   null           try                          Get host related information              IPAddress   ips              ips   Dns GetHostAddresses server                Socket tempSocket   null              IPEndPoint ipe   null               ipe   new IPEndPoint  IPAddress ips GetValue 0   port               tempSocket   new Socket ipe AddressFamily  SocketType Stream  ProtocolType Tcp                Platform Log LogLevel Info   Attempting socket connection to     ips GetValue 0  ToString       on port     port ToString                 tempSocket Connect ipe                if  tempSocket Connected                                s   tempSocket                  s SendTimeout   Coordinate HL7SendTimeout                  s ReceiveTimeout   Coordinate HL7ReceiveTimeout                            else                               return null                             return s                    catch  Exception e                        Platform Log LogLevel Error   Error creating socket connection to     server     on port     port ToString                 Platform Log LogLevel Error   The error is      e ToString                 if  g NoOutputForThreading    false                  rtbResponse AppendText  Error creating socket connection to     server     on port     port ToString                 return null

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It was a silly issue on my side  I had added a defaultproxy to my web config in order to intercept traffic in Fiddler  and then forgot to remove it

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If this happens always  it literally means that the machine exists but that it has no services listening on the specified port  or there is a firewall stopping you   If it happens occasionally - you used the word  sometimes  - and retrying succeeds  it is likely because the server has a full  backlog    When you are waiting to be accepted on a listening socket  you are placed in a backlog   This backlog is finite and quite short - values of 1  2 or 3 are not unusual - and so the OS might be unable to queue your request for the  accept  to consume   The backlog is a parameter on the listen function - all languages and platforms have basically the same API in this regard  even the C  one   This parameter is often configurable if you control the server  and is likely read from some settings file or the registry   Investigate how to configure your server   If you wrote the server  you might have heavy processing in the accept of your socket  and this can be better moved to a separate worker-thread so your accept is always ready to receive connections   There are various architecture choices you can explore that mitigate queuing up clients and processing them sequentially   Regardless of whether you can increase the server backlog  you do need retry logic in your client code to cope with this issue - as even with a long backlog the server might be receiving lots of other requests on that port at that time   There is a rare possibility where a NAT router would give this error should its ports for mappings be exhausted   I think we can discard this possibility as too much of a long shot though  since the router has 64K simultaneous connections to the same destination address port before exhaustion

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The most probable reason is a Firewall   This article contains a set of reasons  which may be useful to you   From the article  possible reasons could be    FTP server settings Software Personal Firewall Settings Multiple Software Personal Firewalls Anti-virus Software LSP Layer Router Firmware Computer Turned Off Computer Not Plugged In Fiddler

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This happened to me too   Sometimes when I open my project this error shown up which was frustrating  The problem was that sometimes the port-number of web service was changing unexpectedly   This problem usually happens when you have more than one copies of the project   My project was calling the Web service with a specific port number which I assigned in the Web Config file of my main project file  As the port number changed unexpectedly  the browser was unable to find the Web service and throwing that error   I solved this by following the below steps   Visual Studio 2010      Go to Properties of the Web service project --  click on Web tab --  In Servers section --  Check Specific port   and then assign the standard port number by which your main project is calling the web service    I hope this will solve the problem   Cheers

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Well  I ve received this error today on Windows 8 64-bit out of the blue  for the first time  and it turns out my my ini had been reset  and the bin mysqld file had been deleted  among other items in the  Program Files MySQL MySQL Server 5 6  folder   To fix it  I had to run the MySQL installer again  installing only the server  and copy a recent version of the my ini file from  ProgramData MySQL MySQL Server 5 6   named my 2014-03-28T15-51-20 ini in my case  don t know how or why that got copied there so recently  back into  Program Files MySQL MySQL Server 5 6    The only change to the system since MySQL worked was the installation of Native Instruments  Traktor 2 and a Traktor Audio 2 sound card  which really shouldn t have caused this problem  and no one else has used the system besides me  If anyone has a clue  it would be kind of you to comment to prevent this for me and anyone else who has encountered this

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Using WampServer 64bit on Windows 7 Home Premium 64bit I encountered this exact problem  After hours and hours of experimentation it became apparent that all that was needed was in my ini to comment out one line  Then it worked fine   commented out 1 line socket mysql  If you put your old  data  files in the appropriate location  WampServer will accept all of them except for the  mysql  folder which it over writes  So then I simply imported a backup of the  mysql  user data from my prior development environment and ran FLUSH PRIVILEGES in a phpMyAdmin SQL window  Works great  Something must be wrong because things shouldn t be this easy

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it might be because of authorisation issues  that was the case for me  If you have for example   Authorize  WriteAccess    or  Authorize  ReadAccess    at the top of your controller functions  try to comment them out

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I just faced this right now       Here on my end  I have 2 separated Visual Studio solutions   sln     opened each one in their own Visual Studio instance   Solution 2 calls Solution 1 code  The problem was related to the port assigned to Solution 1  I had to change the port on solution 1 to another one and then Solution 2 started working again  So make sure you check the port assigned to your project

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I think  you need to check your proxy settings in  internet options   If you are using proxy  hide ip  applications  this problem may be occurs

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I faced same error because when your Server and Client run on same machine the Client need server local ip address not Public ip address to communicate with server you need Public ip address only in case when Server and Client run on separate machine so use Local ip address in client program to connect with server Local ip address can be found using this method    public static string Getlocalip                 try                       IPAddress   localIPs   Dns GetHostAddresses Dns GetHostName                 return localIPs 7  ToString                      catch  Exception                         return  null

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For service reference within a solution    Restart your workstation Rebuild your solution  Update service reference in WCFclient project   At this point  I received messsage  Windows 7  to allow system access  Then the service reference was updated properly without errors

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I had this issue happening often  I found SQL Server Agent service was not running  Once I started the service manually  it got fixed  Double check if the service is running or not    Run prompt  type services msc and hit enter Find the service name -  SQL Server Agent Instance Name    If SQL Server Agent is not running  double-click the service to open properties window  Then click on Start button  Hope it will help someone

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In my scenario  I have two applications   App1 App2   Assumption  App1 should listen to App2 s activities on Port 5000 Error  Starting App1 and trying to listen  to a nonexistent ghost town  produces the error Solution   Start App2 first  then try to listen using App1

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There is a service called  SQL Server Browser  that provides SQL Server connection information to clients   In my case  none of the existing solutions worked because this service was not running  I resumed it and everything went back to working perfectly

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This is really specific  but if you receive this error after trying to connect to a database using mongo  what worked for me was running mongod exe before running mongo exe and then the connection worked fine  Hope this helps someone

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For me  I wanted to start the mongo in shell  irrelevant of the exact context of the question  but having the same error message before even starting the mongo in shell     The process  MongoDB Service  wasn t running in Services  Start cmd as Administrator and type   net start MongoDB   Just to see MongoDB is up and running just type mongo  in cmd it will give Mongo version details and Mongo Connection URL

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In my case this was caused by a faulty deployment where a setting in my web config was not made   A collegue explained that the IP address in the error message represents the localhost    When I corrected the web config I was then using the correct url to make the server calls and it worked   I thought I would post this in case it might help someone

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I got this error in an application that uses AppFabric  The clue was getting a DataCacheException in the stack trace  To see if this is the issue for you  run the following PowerShell command      AppFabricCachingService   RemoteRegistry         get-service        If either of these two services are stopped  then you will get this error

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One more possibility --  Make sure you re trying to open the same IP address as where you re listening   My server app was listening to the host machine s IP address using IPv6  but the client was attempting to connect on the host machine s IPv4 address

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When you call service which has only HTTP  ex  http   example com  and you call HTTPS  ex  https   example com   you get exactly this error -  quot No connection could be made because the target machine actively refused it quot

[c#] No connection could be made because the target machine actively refused it?

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