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File Transfer Issue Using Active FTP - Port Command

File Transfer Issue Using Active FTP - Port Command

File Transfer Issue Using Active FTP - Port Command

Hi All,

Hopefully I can get some direction on this problem.

I have an issue with FTP file transferring to server from a few remote PCs.


I have 2 client PC's (supposedly identical SOE builds)...

For the successful PC when trying to upload a file the FTP server, a Wireshark trace shows the following;

File Transfer Protocol (FTP)
PORT 10,1,5,37,236,92\r\n
Request command: PORT
Request arg: 10,1,5,37,236,92
Active IP address: (
Active port: 60508

File Transfer Protocol (FTP)
200 PORT command successful.\r\n
Response code: Command okay (200)
Response arg: PORT command successful.

But for a failed PC trying to upload the same file, Wireshark trace shows the following:-

File Transfer Protocol (FTP)
PORT 127,0,0,1,247,151\r\n <---------------- Local host IP address inserted
Request command: PORT
Request arg: 127,0,0,1,247,151
Active IP address: (
Active port: 63383
Active IP NAT: True <---------------- Looks like NATing is occurring somewhere on PC.

501 Server cannot accept argument.\r\n
Response code: Syntax error in parameters or arguments (501)
Response arg: Server cannot accept argument.

The end user has verified that there is no NAT on the failed PC, and each PC is SOE build identical.

Any ideas would be much appreciated.

RE: File Transfer Issue Using Active FTP - Port Command is the local loop back address. No connection to the remote. Firewall?

Marv ccna

Sales, Installation & Service for Norstar, BCM, Samsung & Allworx Serving Ottawa and Eastern Ontario since 1990

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