This looks like Rebex FTP got stuck while waiting for the
SITE command response. Unlike FileZilla, we are using the
SITE command to detect MS IIS FTP 7 and 7.5, but it looks like this is not working.
To work around this issue, try disabling FTP server feature detection. Locate the following line in the WinFormClient sample:
_ftp = new Ftp();
And add the following line below it:
_ftp.Settings.DoNotDetectFeatures = true;
_ftp.Options |= FtpOptions.DoNotDetectFeatures;
for older versions of Rebex components where the Settings property is not present.
If this doesn't help, please let us know and post an updated log.
More information: The issue itself is unlikely to be caused by MS IIS FTP 7.5 or Rebex FTP alone - we routinely run our automated tests against this FTP server and never noticed such problems. A possible explanation is a FTP-aware firewall along the way that doesn't handle IIS FTP's SITE command response properly.