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ixoyefreak asked on

Windows 2003 Server Running Plesk now experiencing passive FTP issues 425 can't open data connection

FTP users are now getting 425 errors when using passive FTP (active seems to be working fine). These errors started occurring recently. We did make one firewall change recently to explicitly block UDP request on port 0, but that shouldn't have caused this (I even disabled that rule and tested to be certain it wasn't the problem).

Perhaps one of the recent Windows Updates changed something that caused passive FTP to stop working?
NetworkingInternet ProtocolsWindows Server 2003

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Caltor

8/22/2022 - Mon
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Caltor

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ASKER
ixoyefreak

You're right in that the firewall change was the catalyst. As it turns out it disabled an ALG for FTP. I re-enabled the application layer gateway and viola all is well again.

Thanks.
Caltor

Well done. Glad to hear you got it sorted. I've been there before where you make a change and it's the catalyst for something sinister lurking, especially with unapplied changes to firewall rules. For future reference I forgot to mention there is a Microsoft article on troublshooting FTP error 425 at http://support.microsoft.com/kb/129395
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