Timeout Exception on VSTS Test Platform (Azure DevOps), with private build agent

In release 1.4.20 I get a timeout exception everytime the test agent tries to start the FluentMockServer

Following exception is thrown right after "FluentMockServer.Start()"

System.TimeoutException : Service start timed out after 00:00:10
Stack trace
   at WireMock.Server.FluentMockServer..ctor(IFluentMockServerSettings settings) in /Server/FluentMockServer.cs:line 225
   at WireMock.Server.FluentMockServer.Start(Nullable`1 port, Boolean ssl) in /Server/FluentMockServer.cs:line 110

I don’t get this when running the test locally. I’ve tried turning off the windows firewall entirely, on the build machine, but it doesn’t make any difference. I still get the timeout exception. After seeing issue #146, I reverted to version 1.3.18 and I don’t experience any timeout exception anymore.

Anybody know what’s causing the timeout exception?

[StefH]

version 1.0.4.21 will implement code fixes as proposed by @backlune

[backlune]

Been having the same issue on one of our slower build servers. The reason for getting a TimeoutException might be different as some exceptions are not observed when starting the server.

To find out why we were getting TimeoutException I changed to checking it the task had an exception before throwing timeout in FluentMockServer constructor.

            var startTask = _httpServer.StartAsync();

            using (var ctsStartTimeout = new CancellationTokenSource(settings.StartTimeout))
            {
                while (!_httpServer.IsStarted)
                {
                    // Throw out exception if service start fails
                    if (_httpServer.RunningException != null)
                    {
                        throw new Exception($"Service start failed with error: {_httpServer.RunningException.Message}", _httpServer.RunningException);
                    }

                    // Respect start timeout setting by throwing TimeoutException
                    if (ctsStartTimeout.IsCancellationRequested)
                    {
                        if (startTask.Exception != null) { throw startTask.Exception; }
                        throw new TimeoutException($"Service start timed out after {TimeSpan.FromMilliseconds(settings.StartTimeout)}");
                    }

                    ctsStartTimeout.Token.WaitHandle.WaitOne(ServerStartDelay);
                }
            }

In our case a System.IO.FileNotFoundException was being thrown (Not sure why yet but seen some issue with our nugetpackages)