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0 byte files and partial uploads in Serv-U 15.1.7 Hotfix 4 (

Installed 15.1.7 Hotfix 4 ( yesterday and have had lots of problems with users uploading files that either get corrupted or in most cases the files are zero bytes.

You can replicate this situation as follows..

1. Update to Hotfix 4 (

2. Connect to serv-u in FileZilla, for example.

2. Upload around 100 files to the FTP server running serv u

4. Refresh the remote directory

5. You will see random 0 byte files that will say in serv-u they were "received successfully" but are 0 bytes.

This also happens in some cases to large files and they get corrupt / end mid-transfer.

Rolling back to Version (15.1.7 Hotfix 3) resolves the issue so this is a problem with Hotfix 4.

I have replicated this on a fresh server with a trial and installed each hotfix in order.

Please help bshoppivodlouhy

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4 Replies
Product Manager
Product Manager

We are investigating this issue currently and will come soon with update.

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Thanks ivodlouhy

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We have replicated this issue - it is related to Passive Mode only so except rolling back to Hotfix 3 the workaround is to disable Passive Mode in Serv-U setting.
But we are preparing hot fix for this regression issue now.

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Thanks for the update ivodlouhy​, disabling PASV isnt possible for most users who have automated processes or end users without support.

Looking forward to the patch

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