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Do you know if you have progress indication enabled for FTP traffic? Is your problem with uploads or downloads? You said directory listings, so that's a download of sorts..
If it's with uploads, back in 7.4 or 7.5, we introduced upload progress indication. This is included with the Progress Indication ruleset which is in the ruleset library.
If you get a tcpdump to support, they should be able to diagnose the issue. Nothing in MWG should have fundamentally changed with FTP handling.
Do you recall if it started after an upgrade?
the problem occurs even if the ftp host is in the global whitelist.
Progress indication is enabled. The Problem ist with uploads and downloads.
ftp.hp.com works fine! Fast
ftp.dell.com - same problem - hangs on "150 File status okay; about to open data connection."
It takes a very long time to list the directory. Sometimes i get a timeout.