![]() Hope that helps - I'm sure a net search for something like "setup vsftpd to work behind NAT" will give a number of hits with specifics. However, when sending its server IP address and port, it has by mistake sent its local IP address on its local network, which is of course inaccessible (or unroutable) on the outside from the internet. Command: LIST Response: 150 Opening BINARY mode data connection. The FTP server in your case most likely should be connected-to using passive mode. < the public IP 220 ProFTPD 1.3.5d Server (ProFTPD) 203.0.113. Status: Server sent passive reply with unroutable address. When establishing an FTP connection locally from the server, a private IP address is returned and connection fails with No route to host: ftp 203.0.113.2 Connected to 203.0.113.2 (203.0.113.2). The next thing - you also need to forward the passive ftp port range on your router to the ftp server as well as the usual port 21. Server sent passive reply with unroutable address. The port range to use for passive connections (usually by default this is quite a large range, reducing this in the config makes the next thing simpler) The external IP address (some ftp servers have an option to try to auto-detect this at run time)Ģ. Basically you need to enter config entries for:ġ. I don't know how to with vsftpd but with proftpd there are settings in the config file for working behind a NAT'd connection. As it is reporting its LAN IP there and your FTP client considers itself connected to an internet based FTP server it reports that the IP provided is invalid as it is not routeable on the internet. When the ftp connection tries to change into passive mode the server supplies its IP address and what port(s) to use to establish the passive connection. If so then your PC will be connecting to the external interface of your router and then the connection forwarded through NAT back into your LAN to the ftp server. Ensure the Packet time-out is set to 300 seconds. ![]() Ensure the Auto-configure firewall through the UPnP checkbox is not checked. The external IP address (some ftp servers have an option to try to auto-detect this at run time) 2. Question 1: How do I fix Server sent passive reply with an Unroutable address Answer: Go to the Serv U settings at Global Limits & Settings > Settings Network Settings. Due to some reason, the server administrator set the External IP Address of Firewall to '210.13.xx.xx' in IIS. The public IP of this server is 210.13.xx.xx, we have firewall and F5 BIG-IP device, NAT is handled by F5. Hence in the PORT query, Guest OS uses the Private IP address instead of the Public IP of the VM (See frame 93).Ĭlient rejects this request and sends 501 as the Source IP in layer 3 and the IP in the PORT query are different.From what you say I presume you are updating your DNS records to point to the external internet facing IP of your router? Basically you need to enter config entries for: 1. A FTPES server (IIS 7.5 on Windows Server 2008 R2), it's IP is 192.168.1.2, only 1 NIC. When the packet reaches VFP, it gets SNAT'd by the SLB layer. The reason is that the Virtual Machine itself (Guest OS) is not aware of its own public IP address. SolutionĪctive FTP client from an Azure VM does not work if public FTP servers are accessed. Which is not the case when tried accessing via private IP or locally. ![]() ![]() 97 7:41:44 AM 8.2396381 svchost.exe 10.4.0.10 40.76.55.3 FTP FTP:Response to Port 49828,Īs we can see in the above example, the PORT command fails with “ 501 Server cannot accept argument” when accessed the site via public IP address and the reason being, the source IP and the IP which is specified on the PORT query is conflicting
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