IIS FTP 8.5 DataChannel timeout with a linux client -

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i've got strange situation. hope can help. i've got 2 independent iis ftp servers.

  1. iis 7.5 runs standalone vm
  2. iis 8.5 runs on windows server 2012 r2 vm

when connect these ftp servers using filezilla client (or pftp client on ubuntu), both work expected, well. passive mode, no problem.

when 1 of customer's linux client connecting, works great on iis 7.5, not work on iis 8.5

it stops after pasv command timeout. linux client running custom app on fedora has ftp functionality embedded in it.

for authentication i'm using iis manager users.

does have idea of be? or how troubleshoot this?? can test, , see working, except when clients processes entering scene!


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