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Enable Active Mode on SBSimpleFTPSServer

Posted: 07/22/2013 16:06:04
by Tom Garrison (Priority Standard support level)
Joined: 05/16/2013
Posts: 15

I am currently using the SBSimpleFTPServer .Net version in passive mode. I would like to enable active mode to control the port. Do I need to do anything special to enable active mode and set the port? I'm not seeing examples in the documentation.
Posted: 07/22/2013 16:19:40
by Mykola Olshevsky (Basic support level)
Joined: 07/07/2005
Posts: 442

Actually SimpleFTPSServer should support active mode out of the box.
And this doesn't need to set the port since the port for the data connection will be set by client.
Posted: 07/22/2013 16:44:11
by Tom Garrison (Priority Standard support level)
Joined: 05/16/2013
Posts: 15

Active works when I run my solution locally, but doesn't seem to work after I deploy the solution. We are currently running as an Azure Cloud Service. Passive works fine, but when I set to Active, I get this:

Status: Connected
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is current directory
Command: TYPE I
Response: 200 Command okay.
Command: PORT 192,168,1,12,80,109
Response: 200 Command okay.
Command: MLSD
Response: 150 Status okay; about to open data connection.
Error: Connection timed out
Error: Failed to retrieve directory listing
Posted: 07/23/2013 00:45:34
by Ken Ivanov (Team)

Hello Tom,

In fact, the Active mode (that is, server connecting to client) is rarely used in public networks due to a variety of reasons (and it looks like you've come across one of them). The two most popular are a client-side firewall blocking all incoming connections to unknown ports (and as an active mode port is chosen randomly, it is unlikely to be known to the firewall), and 'fake' (internal and not visible from the outside network) IP addresses assigned by some Internet service providers to their clients.

It would be great if you let us know what port and how you would like to control. If it makes sense, the FTPS server component allows you to choose the passive mode port from a pre-defined range - is that what you were actually asking about?



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