I run Fiddler on ubuntu 19.10
Startup log:
zhaozhe@zhaozhe-MRC-WX0:~/soft$ ./progress-telerik-fiddler.AppImage
16:57:14.645 › [Product information] Progress Telerik Fiddler 0.5.0
16:57:14.654 › [System information] Linux zhaozhe-MRC-WX0 5.3.0-40-generic #32-Ubuntu SMP Fri Jan 31 20:24:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
16:57:14.770 › Initializing splash screen.
16:57:14.886 › Attempting to run server - 5 attempts left.
16:57:14.886 › Generating random port.
16:57:14.887 › Trying to start server at port [42420].
16:57:16.046 › Fetching .NET Core server status.
16:57:16.120 › Error occurred while fetching .NET Core server [42420] status. Error message: connect ECONNREFUSED 127.0.0.1:42420
16:57:16.120 › Attempting to run server - 4 attempts left.
16:57:16.120 › Generating random port.
16:57:16.120 › Trying to start server at port [39650].
16:57:16.540 › Fetching .NET Core server status.
16:57:16.626 › Error occurred while fetching .NET Core server [39650] status. Error message: connect ECONNREFUSED 127.0.0.1:39650
16:57:16.626 › Attempting to run server - 3 attempts left.
16:57:16.627 › Generating random port.
16:57:16.627 › Trying to start server at port [26748].
16:57:17.066 › Fetching .NET Core server status.
16:57:17.150 › Error occurred while fetching .NET Core server [26748] status. Error message: connect ECONNREFUSED 127.0.0.1:26748
16:57:17.150 › Attempting to run server - 2 attempts left.
16:57:17.150 › Generating random port.
16:57:17.150 › Trying to start server at port [12887].
16:57:17.575 › Fetching .NET Core server status.
16:57:17.648 › Error occurred while fetching .NET Core server [12887] status. Error message: connect ECONNREFUSED 127.0.0.1:12887
16:57:17.648 › Attempting to run server - 1 attempts left.
16:57:17.648 › Generating random port.
16:57:17.648 › Trying to start server at port [34621].
16:57:18.067 › Fetching .NET Core server status.
16:57:18.140 › Error occurred while fetching .NET Core server [34621] status. Error message: connect ECONNREFUSED 127.0.0.1:34621
16:57:18.140 › Attempting to run server - 0 attempts left.
16:57:18.140 › Maximum number of attempts reached - quitting application.
16:57:18.156 › Generating random port.
16:57:18.156 › Trying to start server at port [58068].