Hi, I am trying to install Fiddler in Redhat-6.8 which is similar to Centos :
Steps followed as per blog installed mono package & it's working,
[root@test]# mcs hello.cs
[root@test]# ls
hello.cs hello.exe
[root@test]# mono hello.exe
Hello Mono World
[root@test]# /usr/lib/mono/mozroots --import --sync
Mozilla Roots Importer - version 5.0.1.1
Download and import trusted root certificates from Mozilla's MXR.
Copyright 2002, 2003 Motus Technologies. Copyright 2004-2008 Novell. BSD licensed.
WARNING: mozroots is deprecated, please move to cert-sync instead.
Downloading from 'https://hg.mozilla.org/releases/mozilla-release/raw-file/default/security/nss/lib/ckfw/builtins/certdata.txt'...
Importing certificates into user store...
190 new root certificates were added to your trust store.
Import process completed.
but output of command mono fiddler.exe gives error shown below :
[root@test Fiddler]# mono Fiddler.exe
exception inside UnhandledException handler: The type initializer for 'System.Windows.Forms.WindowsFormsSynchronizationContext' threw an exception.
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type initializer for 'System.Windows.Forms.XplatUI' threw an exception. ---> System.ArgumentNullException: Could not open display (X-Server required. Check your DISPLAY environment variable)
Parameter name: Display
at System.Windows.Forms.XplatUIX11.SetDisplay (System.IntPtr display_handle) [0x00408] in <298fc9b739c74aebb706be1d082ed5e4>:0
at System.Windows.Forms.XplatUIX11..ctor () [0x00077] in <298fc9b739c74aebb706be1d082ed5e4>:0
at System.Windows.Forms.XplatUIX11.GetInstance () [0x00019] in <298fc9b739c74aebb706be1d082ed5e4>:0
at System.Windows.Forms.XplatUI..cctor () [0x00066] in <298fc9b739c74aebb706be1d082ed5e4>:0
--- End of inner exception stack trace ---
at System.Windows.Forms.Theme.get_MenuAccessKeysUnderlined () [0x00000] in <298fc9b739c74aebb706be1d082ed5e4>:0
at System.Windows.Forms.SystemInformation.get_MenuAccessKeysUnderlined () [0x00005] in <298fc9b739c74aebb706be1d082ed5e4>:0
at System.Windows.Forms.Control..ctor () [0x000e4] in <298fc9b739c74aebb706be1d082ed5e4>:0
at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control:.ctor ()
at System.Windows.Forms.WindowsFormsSynchronizationContext..cctor () [0x00000] in <298fc9b739c74aebb706be1d082ed5e4>:0
[root@test Fiddler]#
My server doesn't have GUI interface.
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Thanks