C:\t\iop>git push
fatal: HttpRequestException encountered.
   An error occurred while sending the request.

Unhandled Exception: System.ObjectDisposedException: Cannot access a closed file.
   at System.IO.__Error.FileNotOpen()
   at System.IO.FileStream.Flush(Boolean flushToDisk)
   at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   at Microsoft.Alm.Git.Trace.Microsoft.Alm.Git.ITrace.Flush()
   at Microsoft.Alm.Cli.Program.Die(String message)
   at Microsoft.Alm.Cli.Program.Die(Exception exception)
   at Microsoft.Alm.Cli.Program.Main(String[] args)
Username for 'https://github.com':
Password for 'https://github.com':
remote: Anonymous access to russellw/iop.git denied.
fatal: Authentication failed for 'https://github.com/russellw/iop.git/'