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"permission denied" can be either of the above as well as several other errors. e.g. your are using your ECE or UCSBnetID credentials on a CoE computer or vice versa

• Navigate to View > Command Palette.
  You can also use a keyboard shortcut, Control+Shift+P on Windows or Command+Shift+P on MacOS to open the command palette.
• Choose Now: Clear Credentials from the command palette.
  Now: Clear credentials commandImage Removed
  The credentials of the current project are cleared.
• (Optional) Navigate to Code > Preferences > Settings > Workspace > Extensions  to check whether the credentials and the instance URL have been deleted for all extensions
  
• to clear ssh keys, also known as ssh targets, you can remove it on the SSH config file ~/.ssh/config where ~ is your home directory and exact path will vary person to person.
• It is also a good idea to clear the ssh host key/target off ~/.ssh/known_hosts which is the file used by almost every other ssh program.
• (Optional) Some extensions save credentials and need to be cleared as well.

  • On Windows: you can press windows key + r then type %USERPROFILE%\.sfdx.

  • On Linux and Mac OS: ~/.sfdx.

  • In that directory you'll find a json file for each login saved, each one named after your username in that org. That json holds the following properties:

    • username
    • orgId
    • accessToken
    • refreshToken
    • instanceUrl
    • loginUrl
    • clientId

    You can delete the ones you don't need.

• (Optional) Navigate to Code > Preferences > Settings > Workspace > Extensions > your_extension_name_here  to check whether the credentials and the instance URL have been deleted for all extensions
  

External Sources of information

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