Connection refused between Master and Remote

[LukeN]

Hello!

 

The two servers in question can definitely communicate with each other via other means - for example the remote can access the master MySQL server.

 

Would anyone be able to help me troubleshoot why this connection failure may be happening? I see the below in the Monitor Version section when I click Show Versions from the master panel.

 

Error: ConnectFailure (Connection refused)

 

Console.log

 

  at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x0019b] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
  --- End of inner exception stack trace ---
 at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x00217] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
 at System.Net.WebConnection.InitConnection (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x000cc] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
 at System.Net.WebOperation.Run () [0x0009a] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
 at System.Net.WebCompletionSource`1[T].WaitForCompletion () [0x00094] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
 at System.Net.HttpWebRequest.GetRequestStream () [0x00016] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
 at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke (System.String methodName, System.Object[] parameters) [0x00029] in <8bc04fd87fca4b3f825d3afe331face2>:0 
 at TCAdmin.SDK.Web.References.ServerUtilities.ServerUtilities.GetMonitorVersion () [0x00000] in <633ba1bbf1fe4ae791a36c31cad7d40c>:0 
 at (wrapper remoting-invoke-with-check) TCAdmin.SDK.Web.References.ServerUtilities.ServerUtilities.GetMonitorVersion()
 at TCAdmin.SDK.Objects.Server.get_MonitorVersion () [0x00016] in <bf9981e33fb545b3897032aedecef0e3>:0 
 at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)
 at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in <15c986724bdc480293909469513cfdb3>:0 

 

Error.log

 

08/31/2019 14:43:50	System.Net.WebException: Error: ConnectFailure (Connection refused) ---> System.Net.Sockets.SocketException: Connection refused
08/31/2019 14:43:50	  at System.Net.Sockets.SocketAsyncResult.CheckIfThrowDelayedException () [0x00014] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	  at System.Net.Sockets.Socket.EndConnect (System.IAsyncResult asyncResult) [0x0002c] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	  at System.Net.Sockets.SocketTaskExtensions+<>c.<ConnectAsync>b__2_1 (System.IAsyncResult asyncResult) [0x00006] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	--- End of stack trace from previous location where exception was thrown ---
08/31/2019 14:43:50	
08/31/2019 14:43:50	  at System.Threading.Tasks.TaskFactory`1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func`2[T,TResult] endFunction, System.Action`1[T] endAction, System.Threading.Tasks.Task`1[TResult] promise, System.Boolean requiresSynchronization) [0x00019] in <15c986724bdc480293909469513cfdb3>:0 
08/31/2019 14:43:50	  at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x0019b] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	   --- End of inner exception stack trace ---
08/31/2019 14:43:50	  at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x00217] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	  at System.Net.WebConnection.InitConnection (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x000cc] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	  at System.Net.WebCompletionSource`1[T].WaitForCompletion () [0x00094] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	  at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke (System.String methodName, System.Object[] parameters) [0x00029] in <8bc04fd87fca4b3f825d3afe331face2>:0 
08/31/2019 14:43:50	  at System.Net.HttpWebRequest.GetRequestStream () [0x00016] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	  at System.Net.WebOperation.Run () [0x0009a] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0 
08/31/2019 14:43:50	  at TCAdmin.SDK.Objects.Server.get_MonitorVersion () [0x00016] in <bf9981e33fb545b3897032aedecef0e3>:0 
08/31/2019 14:43:50	  at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)
08/31/2019 14:43:50	  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in <15c986724bdc480293909469513cfdb3>:0 
08/31/2019 14:43:50	  at (wrapper remoting-invoke-with-check) TCAdmin.SDK.Web.References.ServerUtilities.ServerUtilities.GetMonitorVersion()
08/31/2019 14:43:50	  at TCAdmin.SDK.Web.References.ServerUtilities.ServerUtilities.GetMonitorVersion () [0x00000] in <633ba1bbf1fe4ae791a36c31cad7d40c>:0 

[Alexr03]

Has this happened out of random or has it always happened since you connected the two systems together?

 

I know we encounter some issues when pressing "Show Versions" that it will just timeout. Usually restarting the monitor on the affected node will fix this.

 

It could also be a firewall issue, so you can try temporarily disabling it and testing it again.

 

If other people have other suggestions they can suggest it, otherwise i'd suggest opening a support ticket with Luis.

[LukeN]

Hey, this is my first attempt at connecting a remote server.

 

I attempted to disable ufw and I still face the issue, I also rebooted the monitors on both servers

 

Thanks for your reply!

[LukeN]

I also get a connect failure when I attempt to create game services on the remote, so definitely an issue beyond the UI

[LFA]

For Linux servers there is a bug in mono when using https to communicate between servers. I reported it and it should be fixed in the next mono update. To work around this bug you can go to each of the server's settings, set the secure port to 0 and restart the monitors.

[LukeN]

Ah that makes more sense, thank you LFA

 

I have done that and actually rebooted the whole server as the monitors themselves did not make a difference. No change I'm afraid - what would you recommend?

 

08/31/2019 18:14:48 System.Net.WebException: Error: ConnectFailure (Connection refused) ---> System.Net.Sockets.SocketException: Connection refused

08/31/2019 18:14:48 at System.Net.Sockets.SocketAsyncResult.CheckIfThrowDelayedException () [0x00014] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48 at System.Net.Sockets.Socket.EndConnect (System.IAsyncResult asyncResult) [0x0002c] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48 at System.Net.Sockets.SocketTaskExtensions+<>c.<ConnectAsync>b__2_1 (System.IAsyncResult asyncResult) [0x00006] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48 at System.Threading.Tasks.TaskFactory`1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func`2[T,TResult] endFunction, System.Action`1[T] endAction, System.Threading.Tasks.Task`1[TResult] promise, System.Boolean requiresSynchronization) [0x00019] in <15c986724bdc480293909469513cfdb3>:0

08/31/2019 18:14:48 --- End of stack trace from previous location where exception was thrown ---

08/31/2019 18:14:48 --- End of inner exception stack trace ---

08/31/2019 18:14:48 at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x0019b] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48 at System.Net.WebConnection.InitConnection (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x000cc] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48 at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x00217] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48 at System.Net.WebCompletionSource`1[T].WaitForCompletion () [0x00094] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48 at System.Net.WebOperation.Run () [0x0009a] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48

08/31/2019 18:14:48 at System.Net.HttpWebRequest.GetRequestStream () [0x00016] in <cc2aa03ac5ad4081bf06b04ddbd6fdb9>:0

08/31/2019 18:14:48 at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke (System.String methodName, System.Object[] parameters) [0x00029] in <8bc04fd87fca4b3f825d3afe331face2>:0

08/31/2019 18:14:48 at TCAdmin.SDK.Web.References.ServerUtilities.ServerUtilities.GetMonitorVersion () [0x00000] in <633ba1bbf1fe4ae791a36c31cad7d40c>:0

08/31/2019 18:14:48 at (wrapper remoting-invoke-with-check) TCAdmin.SDK.Web.References.ServerUtilities.ServerUtilities.GetMonitorVersion()

08/31/2019 18:14:48 at TCAdmin.SDK.Objects.Server.get_MonitorVersion () [0x00016] in <bf9981e33fb545b3897032aedecef0e3>:0

08/31/2019 18:14:48 at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)

08/31/2019 18:14:48 at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in <15c986724bdc480293909469513cfdb3>:0

[LFA]

Make sure the master's standard port is not blocked by the firewall. You should be able to view http://masterip:8890 with your browser. It will show a white background with invalid hostname.

[LukeN]

Confirmed it's not blocked, even with the firewall completely disabled on the remote and master, after a reboot of the monitors I have no luck and am greeted with the same block in the error logs related to a failed connection.

 

Is there a version of mono you would particularly recommend for me to use? Currently I'm rocking 6.0.0.327 on both master and remote.

[LukeN]

I can telnet to port 8890 on the master but not the remote (from my desktop). Is this where the problem may be occurring?

 

For the record both boxes have the same UFW set up - even with the firewall disabled I still cannot telnet on port 8890.

[LFA]

Other than the https bug the latest mono version is fine. Make sure port 8890 is open by mono with this command from ssh:

netstat -tlnp|grep mono

Create a support ticket so I can take a look.

[LukeN]

Hey - sorry to remain quiet on this for so long. This was related to OVH > OVH server configuration for remote and master, since OVH use their own private networking between data centers it was interfering with the web servers SSL communication.