The GFI FaxMaker Online client promts the error "Error: An error was encountered while sending the fax. The error is: Error: C-0001 - A registry access error occurred. Make sure that you have read/write access to the GFI product registry section." when the user tries to submit a fax request .
Select View > Options > [TAB: Connection Settings] from GFI FaxMaker Fax Message form
Verify whether the sender email address is present. If not, please complete the field: email address and confirm the change with "OK".
Otherwise, verify whether the logged user on the GFI FaxMaker Online client machine has full read / write access to the following registry path:
x86: HKLM\Software\GFI Fax & Voice \FAXmaker Client
x64: HKLM\Software\Wow3432Node\GFI Fax & Voice \FAXmaker Client