Opened 15 years ago

Closed 14 years ago

Last modified 10 years ago

#4199 closed Bug report (rejected)

Maximum number of connections

Reported by: Aximili Owned by:
Priority: normal Component: FileZilla Client
Keywords: simultaneous connections Cc:
Component version: Operating system type: Linux
Operating system version: XP Pro SP3 (initial report) and Linux (recent SUSE)


You cannot to use FileZilla on, as it does not allow multiple connections from the same IP.

Going to Site Manager - Transfer Setting - Limit simultaneous connections to 1 <-- does not work.

The only way is to change the global setting (Edit - Settings - Transfers).

Other than that FileZilla is the best, thanks.

Change History (5)

comment:1 by Tim Kosse, 15 years ago

Status: newmoreinfo

Please describe the exact steps necessary to reproduce it on a public server.

comment:2 by Roberto Jimeno, 15 years ago

Operating system type: WindowsLinux
Operating system version: XP Pro SP3XP Pro SP3 (initial report) and Linux (recent SUSE)
Priority: lownormal
Status: moreinfonew

Here some more information:

Status: Connection established, waiting for welcome message...
Response: 421 Too many connections (8) from this IP
Error: Could not connect to server
Status: Delaying connection due to previously failed connection attempt...

the top area on Filezilla's window. I *DO* have my File -> Site Manager -> Transfer Settings -> Limit number of simutaeous connections --> selected and set to one. In spite of that I still get error 421 for what seem to be 8 connections. I noticed that the problem appeared less frequently than it did before I had it set for "unlimited" connections, but still puzzles me and I believe Filezilla could do better to handle picky servers like the ones provided by Total Choice Hosting LLC.

Please ask questions if you want more information so I can provide it to you.

comment:3 by Tim Kosse, 15 years ago

Resolution: rejected
Status: newclosed

If it still happens if limited to 1 I suspect a broken server. You need to contact your server administrator so that he can get rid of that stupid limit. He might not know it, but a modern server can easily handle thousands of simultaneous connections.

comment:4 by wireblue, 14 years ago

Resolution: rejected
Status: closedreopened

I can verify this bug in FileZilla (Windows XP SP3).

FileZilla does not obey the Max Connection Limit (in Site Manager > Transfer Settings > Limit number of connections...). Servers will block our IP if we transfer too many files in a short period of time. On one occasion FileZilla had opened 830+ connections to the one server, even though the limit was set to 1 or 2 connections.

Removing the FTP server's connection limits is not a valid solution. Limits are in place for a reason, and not all users are in a position to either change the FTP server config or request such changes.

Would appreciate any efforts in resolving this bug.
Thanks, Wireblue.

comment:5 by Tim Kosse, 14 years ago

Resolution: rejected
Status: reopenedclosed

The maximum number of FTP connections that can ever be used by FileZilla at the same time is 10 + 1/tab if no limits are set. It is impossible to get above that.

If you see 830+ open connections on your server there are two possible explanations:

  • Broken router and/or firewall that's silently dropping connection
  • Broken server

In either case, this isn't a bug in FileZilla as it just cannot possibly open this many simultaneous connections.

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