Synchronet v3.17b-Win32 (install) has been released (Jan-2019).

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faq:tcpip [2019/01/01 23:53]
digital man Added WS & WSS, removed some unused UDP ports. Added SMTP-Submission/TLS and POP3 over TLS ports.
faq:tcpip [2019/01/17 16:17] (current)
digital man [FTP NAT] Fixed typos. Removed stale info.
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 [[http://​www.ncftpd.com/​ncftpd/​doc/​misc/​ftp_and_firewalls.html|This document]] contains the technical details about how and why and the recommended solutions. ​ [[http://​www.ncftpd.com/​ncftpd/​doc/​misc/​ftp_and_firewalls.html|This document]] contains the technical details about how and why and the recommended solutions. ​
  
-**Note**: Most web browsers ​(e.g. //Microsoft Internet Explorer//) use passive ​FTP transfer mode by default. ​+**Note**: Most web browsers ​use //passive// FTP transfer mode by default, though this may be configurable
  
-**Note**: Some FTP clients (e.g. the Windows command-line FTP client, ''​ftp.exe''​) only support active mode transfers. ​+**Note**: Some FTP clients (e.g. the Windows command-line FTP client, ''​ftp.exe''​) ​//only// support ​//active// mode transfers. ​
  
-Enabling the logging of FTP data channel activity can help diagnose these kinds of problems. This can be done by adding the ''​DEBUG_DATA''​ option to the ''​Options''​ value in the ''​[FTP]''​ section of your ''​[[dir:​ctrl]]/​[[config:​sbbs.ini]]''​ file or by checking the //Data Channel Activity// checkbox in the //Log// tab of the FTP Server Configuration dialog in the Synchronet Control Panel for Win32.  +Enabling the logging of FTP data channel activity can help diagnose these kinds of problems. This can be done by adding the ''​DEBUG_DATA''​ option to the ''​Options''​ value in the ''​[FTP]''​ section of your ''​[[dir:​ctrl]]/​[[config:​sbbs.ini]]''​ file or by checking the //Data Channel Activity// checkbox in the //Log// tab of the FTP Server Configuration dialog in the Synchronet Control Panel for Windows
- +
-If you're having problems with passive transfers and you're seeing +
-  !UNSUPPORTED COMMAND from username: '​P@SW'​ +
-in your FTP server log/window output, you're probably using an //SMC Barricade// router (see [[http://​www.gbnetwork.co.uk/​smcftpd/​|this document]] for details). Upgrade to Synchronet v3.13a (FTP Server Revision 1.296) or later to work-around this problem with this device+
  
 If you're having problems with passive (PASV) transfers through your NAT/​firewall device and you're running Synchronet v3.13a (FTP Server Revision 1.296) or later: ​ If you're having problems with passive (PASV) transfers through your NAT/​firewall device and you're running Synchronet v3.13a (FTP Server Revision 1.296) or later: ​
-If the remote client is attempting to connect to your [[#private IP]] address (your NAT device isn't translating the PASV response from the FTP server) and you have a static [[#public IP]] address, you can work-around this limitation of your NAT device by using the ''​PasvIpAddress''​ value in the ''​[FTP]''​ section of your ''​[[dir:​ctrl]]/​[[config:​sbbs.ini]]''​ file to specify your [[#public IP]] address. ​+If the remote client is attempting to connect to your [[#private IP]] address (your NAT device isn't translating the PASV response from the FTP server) and you have a static [[#public IP]] address, you can work-around this limitation of your NAT device by using the ''​PasvIpAddress''​ value in the ''​[FTP]''​ section of your ''​[[dir:​ctrl]]/​[[config:​sbbs.ini]]''​ file to specify your IPv4 [[#public IP]] address. ​
  
 This problem can be identified (on the client) by finding a comma-separated [[#private IP]] address in the PASV response received from the FTP server (in response to a directory or file transfer request from the client). ​ This problem can be identified (on the client) by finding a comma-separated [[#private IP]] address in the PASV response received from the FTP server (in response to a directory or file transfer request from the client). ​
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 If you have a dynamically-assigned IP address (via DHCP), then your IP address may change at some point, so setting the ''​PasvIpAddress''​ to a specific IP address may not be a long term solution for your FTP Server. In Synchronet v3.14a and later, you can enable the new //Lookup Passive IP// feature by checking the //Lookup// checkbox on the //Passive// tab of the FTP Server Configuration Dialog in [[monitor:​SBBSCTRL]]-Win32,​ or by adding ''​LOOKUP_PASV_IP''​ to the Options value in the ''​[FTP]''​ section of your ''​[[dir:​ctrl]]/​[[config:​sbbs.ini]]''​ file. This option instructs the Synchronet FTP Server to perform a DNS hostname lookup on your BBS's public hostname and use the resulting IP address (which should be your BBS's [[#public IP]] address) in passive responses. ​ If you have a dynamically-assigned IP address (via DHCP), then your IP address may change at some point, so setting the ''​PasvIpAddress''​ to a specific IP address may not be a long term solution for your FTP Server. In Synchronet v3.14a and later, you can enable the new //Lookup Passive IP// feature by checking the //Lookup// checkbox on the //Passive// tab of the FTP Server Configuration Dialog in [[monitor:​SBBSCTRL]]-Win32,​ or by adding ''​LOOKUP_PASV_IP''​ to the Options value in the ''​[FTP]''​ section of your ''​[[dir:​ctrl]]/​[[config:​sbbs.ini]]''​ file. This option instructs the Synchronet FTP Server to perform a DNS hostname lookup on your BBS's public hostname and use the resulting IP address (which should be your BBS's [[#public IP]] address) in passive responses. ​
  
-If your firewall cannot dynamically open/​forward FTP PASV data ports for incoming passive FTP data connections,​ you can specifiy ​a limited range of TCP port numbers to use for passive transfers by modifying the PasvPortLow and PasvPortHigh values in the ''​[FTP]''​ section of your ''​[[dir:​ctrl]]/​[[config:​sbbs.ini]]''​ file. You will of course need to configure your firewall device to open/​forward these ports to your FTP server. ​+If your firewall cannot dynamically open/​forward FTP PASV data ports for incoming passive FTP data connections,​ you can specify ​a limited range of TCP port numbers to use for passive transfers by modifying the PasvPortLow and PasvPortHigh values in the ''​[FTP]''​ section of your ''​[[dir:​ctrl]]/​[[config:​sbbs.ini]]''​ file. You will of course need to configure your firewall device to open/​forward these ports to your FTP server. ​
  
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