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AuthorForum: PowerTCP SSL for ActiveX
Topic: 521 PROT P required
phlexss

From: Waalwijk, Netherlands
Posts: 31
Member Since: 03/17/04
posted January 25, 2011 4:53 PM

When I connect to an FTPS server with DART SSL FTPS ActiveX I get the message:

521 PROT P required

What does this mean?
Nick B (Admin)

From: Utica, NY USA
Posts: 567
Member Since: 05/25/10

Extra Support Options
Custom Application Development

posted January 26, 2011 9:57 AM

Hello,

This indicates that your server requires the Data Connection Security Negotiation to use Private. See the RFC for more details: http://www.faqs.org/rfcs/rfc4217.html

The latest version of our FTP control (which includes security) will automatically send the PROT P command if Authentication is set to atExplicitNormal, atSecureData, atImplicitNormal, or atImplicitLogin. If you are interested in upgrading, please contact sales@dart.com

Depending on your version of our control, you may be able to send this before any data port is opened to use PROT P (and Authentication is set to any of the aforementioned values):
SecureFtp1.Command "PBSZ 0", result
SecureFtp1.Command "PROT P", result

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-Non-current subscribers must contact sales@dart.com to update subscription and receive continued support as needed.
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Nick B (Admin)

From: Utica, NY USA
Posts: 567
Member Since: 05/25/10

Extra Support Options
Custom Application Development

posted January 26, 2011 10:01 AM

Please also see this post for more information on sending the PBSZ and PROT P commands:

http://support.dart.com/postings?topicid=7549
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