Hello,

I failed to launch the fiddler with the error:

Error occurred while fetching .NET Core server [4264] status. Error message: connect ECONNREFUSED 127.0.0.1:8866

I copied the log of launching the fiddler on ubuntu. Do you know how to resolve the problem? Thanks a lot!

09:57:02.556 › [Product information] Fiddler Everywhere 1.5.1
09:57:02.562 › [System information] linux (Linux/x64) - version 5.8.0-48-generic
09:57:02.728 › Initializing splash screen.
09:57:02.731 › Attempting to run server - 5 attempts left.
09:57:02.734 › Calculating the URL of ASP.NET Server application.
09:57:02.747 › Generating random port.
09:57:02.748 › Trying to start server at port [36089].
09:57:04.183 › Fetching .NET Core server status.
09:57:04.197 › Error occurred while fetching .NET Core server [36089] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:04.200 › Attempting to run server - 4 attempts left.
09:57:04.200 › Calculating the URL of ASP.NET Server application.
09:57:04.200 › Generating random port.
09:57:04.201 › Trying to start server at port [59053].
09:57:04.220 › Unable to start server process, closed with code: 143
09:57:04.221 › Fetching .NET Core server status.
09:57:04.227 › Error occurred while fetching .NET Core server [59053] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:05.010 › Fetching .NET Core server status.
09:57:05.012 › Error occurred while fetching .NET Core server [59053] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:05.015 › Attempting to run server - 3 attempts left.
09:57:05.015 › Calculating the URL of ASP.NET Server application.
09:57:05.015 › Generating random port.
09:57:05.016 › Trying to start server at port [29611].
09:57:05.071 › Unable to start server process, closed with code: 143
09:57:05.072 › Fetching .NET Core server status.
09:57:05.073 › Error occurred while fetching .NET Core server [29611] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:05.866 › Fetching .NET Core server status.
09:57:05.868 › Error occurred while fetching .NET Core server [29611] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:05.870 › Attempting to run server - 2 attempts left.
09:57:05.871 › Calculating the URL of ASP.NET Server application.
09:57:05.871 › Generating random port.
09:57:05.871 › Trying to start server at port [14452].
09:57:05.923 › Unable to start server process, closed with code: 143
09:57:05.923 › Fetching .NET Core server status.
09:57:05.925 › Error occurred while fetching .NET Core server [14452] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:06.686 › Fetching .NET Core server status.
09:57:06.688 › Error occurred while fetching .NET Core server [14452] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:06.691 › Attempting to run server - 1 attempts left.
09:57:06.691 › Calculating the URL of ASP.NET Server application.
09:57:06.692 › Generating random port.
09:57:06.692 › Trying to start server at port [4264].
09:57:06.728 › Unable to start server process, closed with code: 143
09:57:06.729 › Fetching .NET Core server status.
09:57:06.730 › Error occurred while fetching .NET Core server [4264] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:07.510 › Fetching .NET Core server status.
09:57:07.512 › Error occurred while fetching .NET Core server [4264] status. Error message: connect ECONNREFUSED 127.0.0.1:8866
09:57:07.515 › Maximum number of attempts reached - quitting application.
09:57:07.516 › Unable to start the server, error is Maximum number of attempts reached - quitting application.
09:57:07.517 › [CPU information] The processor model is: Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz with number of cores: 1 and working at 1.8 GHz frequency
09:57:07.517 › [Memory information] The total amount of memory is 7961.8984375 MBs.
09:57:07.621 › Unable to start server process, closed with code: 143
09:57:07.625 › Fetching .NET Core server status.
09:57:07.641 › PM: fiddler(15348):CPU 24.00%, MEM 2.08MB/0.03% / fiddler-everywh(15344):CPU 9.60%, MEM 113.16MB/1.42% / fiddler-everywh(15361):CPU 0.10%, MEM 41.57MB/0.52% / fiddler-everywh(15363):CPU 0.00%, MEM 6.91MB/0.09% / fiddler-everywh(15391):CPU 0.60%, MEM 54.71MB/0.69% / fiddler-everywh(15395):CPU 0.00%, MEM 9.43MB/0.12% / fiddler-everywh(15401):CPU 0.20%, MEM 47.88MB/0.60% / Fiddler.WebUi <defunct>(15629):CPU 65.00%, MEM 0.00MB/0.00%
[2021-03-26T01:57:07.642Z] Warning: Error from HTTP request. Error: connect ECONNREFUSED 127.0.0.1:8866
[2021-03-26T01:57:07.642Z] Warning: Error from HTTP request. Error: connect ECONNREFUSED 127.0.0.1:8866
[2021-03-26T01:57:07.643Z] Error: Failed to complete negotiation with the server: Error: connect ECONNREFUSED 127.0.0.1:8866
[2021-03-26T01:57:07.643Z] Error: Failed to complete negotiation with the server: Error: connect ECONNREFUSED 127.0.0.1:8866
[2021-03-26T01:57:07.644Z] Error: Failed to start the connection: Error: connect ECONNREFUSED 127.0.0.1:8866
[2021-03-26T01:57:07.644Z] Error: Failed to start the connection: Error: connect ECONNREFUSED 127.0.0.1:8866
09:57:07.644 › {
  constructor: 'Error',
  errno: 'ECONNREFUSED',
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 8866,
  stack: 'Error: connect ECONNREFUSED 127.0.0.1:8866\n' +
    '    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1128:14)'
}
09:57:07.647 › {
  constructor: 'Error',
  errno: 'ECONNREFUSED',
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 8866,
  stack: 'Error: connect ECONNREFUSED 127.0.0.1:8866\n' +
    '    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1128:14)'
}
09:57:07.663 › Error occurred while fetching .NET Core server [4264] status. Error message: connect ECONNREFUSED 127.0.0.1:8866

Hi Nick, it works, thanks so much!