Protocol Problem

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Rod Lockwood
500 Command not understood
Posts: 4
Joined: 2014-02-02 20:04
First name: Rod
Last name: Lockwood
Location: Ypsilanti, Michigan

Protocol Problem

#1 Post by Rod Lockwood » 2020-02-08 06:34

I have used FileZilla (in Windows and Linux) for 15 years to maintain my websites. I had to shut down one site a few years back, another site is being maintained by a new webmaster, and my small personal site was erased when my ISP did an overhaul. I am just now trying to access my personal site again after the ISP re-instated it. Since all of my settings for FileZilla are gone I had to start over. I used the Network Configuration Wizard in FileZilla 3.46.3 and successfully setup my site. But when I try to access it I keep getting “Command not supported by this protocol”. Unfortunately, it doesn’t indicate what command. I thought I still had to change something, especially since it switched from one of the FTP protocols to the HTTP one. These are my current settings and the current test results. Windows 7 Pro firewall is off.
The router firewall is set for FileZilla Client, tcp, 50000-50050, 50000, 3600 seconds.

Protocol: HTTP - Hypertext Transfer Protocol
Host: Port: 50000
Logon Type: normal
Default remote directory: /
Synchronized browsing and directory comparison are checked. Limit number of simultaneous connections is not checked.

Passive, Allow fallback
Use the server‘s external IP address
Use the following IP address:, Don‘t use external IP address on local connections.
Use the following port range: 50000 - 50050

Test results:
Connecting to
Connection established, waiting for welcome message.
Response: 220 FZ router and firewall tester ready
USER FileZilla
Response: 331 Give any password.
PASS 3.46.3
Response: 230 logged on.
Checking for correct external IP address
IP bgc-bjf-bge-bja
Response: 200 OK
PREP 50009
Response: 200 Using port 50009, data token 1579121009
PORT 162,195,164,190,195,89
Response: 200 PORT command successful
Response: 150 opening data connection
Response: 503 Failure of data connection.
Server sent unexpected reply.
Connection closed

Online FTP tester
Port: 21
Protocol: Explicit FTP over TLS, Allow fallback...

Test Logs (both tests the same)
Status: Resolving address of
Error: Could not resolve hostname: Name or service not known

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Posts: 25241
Joined: 2006-05-01 03:28
Location: Germany

Re: Protocol Problem

#2 Post by boco » 2020-02-08 19:05

I don't really understand the question. FileZilla does not support access by HTTP, only FTP (+FTPS), SFTP and Storj.

(If you are using FileZilla Pro and your hoster uses one of the Pro-supported storage protocols, please ask your question in the dedicated FileZilla Pro customer forum (viewtopic.php?f=2&t=50124).
No support requests per PM! You will NOT get any reply!!!
FTP connection problems? Do yourself a favor and read Network Configuration.
FileZilla connection test:

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