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Old 03-09-2007, 05:33 PM   #1
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Registered: Mar 2007
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A Strange - 421 Service not available, remote server has closed connection - problem

Here is my machine configuration:

I have 3 window server 2003. Each one hosts a VMWare server, which in turn contains both window based and linux based virtual machines.

All the window based virtual machines have no problem connecting to any of the outside world FTP server. But all the linux based (i386-redhat-linux-gnu version 2.4.20-8) virtual machines returns the "421 Service not available, remote server has closed connection" error right after the username is entered. For instance:

ftp> open
Connected to (
220 (vsFTPd 2.0.1)
Name ( vince
421 Service not available, remote server has closed connection
Login failed.
No control connection for command: Transport endpoint is not connected

The strange things is, if I try "ping hostname" first, then immediately follow by "ftp hostname", everything works fine. Any other time, the above error occurs. Everything worked fine before, until yesterday the problem suddenly occurs.

Any insight will be greatly appreciated!

Best Regards,
Old 03-14-2007, 02:43 PM   #2
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Registered: Mar 2007
Posts: 2

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Lightbulb solved

We've figured out the cause of the problem. We have two different DSL lines. Our router has a capability to intelligently balance accross multiple DSL connections. One of the DSL line has problem with the ftp connection. After we disabled the problematic DLS line, the problem doesn't occur anymore.



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