<div>
Nor can we unless you give some proper information.<br />
<br />
Forefront fully rolled up and patched? Version of TMG?<br />
Ever worked? Never worked?<br />
FTP client or through browser?<br />
All sites? Only some sites?<br />
Sites that need authentication?<br />
All users? Admins? Just one user failing?<br />
<br />
All client machines? Just non-domain devices failing?<br />
<br />
We can help - but not until you have helped yourself by providing info we can work with
</div>


Nor can we unless you give some proper information.

Forefront fully rolled up and patched? Version of TMG?
Ever worked? Never worked?
FTP client or through browser?
All sites? Only some sites?
Sites that need authentication?
All users? Admins? Just one user failing?

All client machines? Just non-domain devices failing?

We can help - but not until you have helped yourself by providing info we can work with

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<div class="content wysiwyg-content">
I am getting Error 502 and 12015 when trying to access FTP sites via Forefront Threat Management Gateway.<br />
<br />
Cannot figure out why.
</div>
</div>


I am getting Error 502 and 12015 when trying to access FTP sites via Forefront Threat Management Gateway.

Cannot figure out why.

Forefront Threat

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.