Windows 7 - Can't connect to FTP server on LAN when VPN connection is up.
The FTP server is IP 192.168.0.10 and the PC is 192.168.0.4 (IP is used so not DNS issue) VPN is default gateway but routes clearly specify the LAN address. Connection from other LAN PC's are O.K. - Firewall O.K. C:\Windows\system32>route print =========================================================================== Interface List 30...........................VPN Connection 11...00 19 66 5a aa b8 ......Realtek RTL8168B/8111B Family PCI-E Gigabit Ethe et NIC (NDIS 6.20) 1...........................Software Loopback Interface 1 17...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #3 12...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface 16...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #2 21...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #7 15...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter 19...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #5 18...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #4 20...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #6 24...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #10 22...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #8 26...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #12 23...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #9 25...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #11 28...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #13 27...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2 36...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter 29...00 00 00 00 00 00 00 e0 Microsoft 6to4 Adapter #14 =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.4 4235 0.0.0.0 0.0.0.0 On-link 192.168.10.11 11 83.245.0.0 255.255.0.0 On-link 192.168.0.4 4237 83.245.255.255 255.255.255.255 On-link 192.168.0.4 4491 109.123.89.5 255.255.255.255 192.168.0.1 192.168.0.4 4236 127.0.0.0 255.0.0.0 On-link 127.0.0.1 4531 127.0.0.1 255.255.255.255 On-link 127.0.0.1 4531 127.255.255.255 255.255.255.255 On-link 127.0.0.1 4531 192.168.0.0 255.255.255.0 On-link 192.168.0.4 4491 192.168.0.4 255.255.255.255 On-link 192.168.0.4 4491 192.168.0.255 255.255.255.255 On-link 192.168.0.4 4491 192.168.10.11 255.255.255.255 On-link 192.168.10.11 266 212.27.0.0 255.255.0.0 192.168.0.1 192.168.0.4 4237 224.0.0.0 240.0.0.0 On-link 127.0.0.1 4531 224.0.0.0 240.0.0.0 On-link 192.168.0.4 4492 224.0.0.0 240.0.0.0 On-link 192.168.10.11 11 255.255.255.255 255.255.255.255 On-link 127.0.0.1 4531 255.255.255.255 255.255.255.255 On-link 192.168.0.4 4491 255.255.255.255 255.255.255.255 On-link 192.168.10.11 266 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 212.27.0.0 255.255.0.0 192.168.0.1 2 83.245.0.0 255.255.0.0 On-link 2 =========================================================================== Any ideas? If I use FileZilla however to connect to the FTP Server with the VPN up it connects without problem
February 14th, 2011 5:22am

With VPN, can you ping the FTP? If yes, can you telnet port 21?Bob Lin, MS-MVP Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net How to Setup Windows, Network, VPN & Remote Access on http://www.howtonetworking.com
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February 14th, 2011 9:32am

YYes I can ping it, Telnet to it AND Start a WIndows 7 ftp session BUT not the software in the ftp client - I am now suspecting that software is not playingh by the rules? What do you think.
February 14th, 2011 10:20am

If you can telnet FTP port, it could be passive mode issue. You may modify it depending on the software. This post may help too. Troubleshooting Outbound FTP Access in ISA Server - Networking ... 1 post - Last post: Feb 4, 2010 The default setting for the ISA Server FTP access filter is read-only. Either Active or Passive FTP mode can be used, according to ... www.chicagotech.net/netforums/viewtopic.php?f=4&t=9591 Bob Lin, MS-MVP Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net How to Setup Windows, Network, VPN & Remote Access on http://www.howtonetworking.com
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February 14th, 2011 5:46pm

Others manage to use the same software (which has built in ftp) to the same server - so quite sure that it is not an active / passive issue. Not using ISA server either. I have convienced myself now that the software must be selecting the wrong adaptor. With VPN down - No problems at all, VPN up - MS ftp o.k. FileZilla o.k. Other ftp software not O.K. - routes (see above) above 192.168.0.0 point to network adaptor.
February 17th, 2011 11:23am

After a lot of confusion it was all the result of a domain name suffix (The host is a member of a domain) - when the VPN was up it was the default gateway and behaved quite differently - resolving the ftp target to a server not running ftp. When VPN down all fine. The host was not in the domain dns - adding it solved the problem.
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June 27th, 2011 12:34pm

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