SFTP synchronisation error

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Posts: 3
Joined: 1 Apr 2020

vtiger57

Hello,

When i try to use SFTP synchronisation with a cloud, each time i have a file making more than 2Go to download or upload i get message :

"Cannot read file attributes of "sftp://---------" LIBSSH2_ERROR_SOCKET_SEND:Unable to send STAT/LSTAT/SETSTAT command [libssh_sftp_lstat]

The cloud, i use, is supporting SFTP transfer.

If i use FTP synchronisation it is OK, but i think less secured ?
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Zenju

This is the error returned by _libssh2_channel_write() failing so send the SFTP command package. I can't imagine how this could be related to file sizes. Maybe the sending direction got corrupted by the previous operation.

Regarding FTP: FFS encrypts both data and command channels if "Explicit SSL/TLS" is enabled, so it's a valid alternative.
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vtiger57

Hello Zenju,

I confirm you that all the files making more than 2Go abort in SFTP session transfer meanwhile in filezilla no problem with same protocol. If any personal message possible on forum i can give you the cloud supplier name.

But as FTP with Explicit SSL/TLS is working fine, it is ok for me.
Thanks for your quick reply.
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Zenju

If any personal message possible on forum i can give you the cloud supplier name. vtiger57, 02 Apr 2020, 15:57
It would be great if you could provide me with details on how to reproduce the issue. Just shoot me an email (e.g. the one on the bottom of FFS's homepage).
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Zenju

Full error message:
bug_2Go.png
bug_2Go.png (56.03 KiB) Viewed 1171 times
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Zenju

There are *two* errors occurring, and the screenshot is only showing the second one. The interesting parts are likely in the first one. I've fixed FFS to merge and report both errors:
https://www.mediafire.com/file/0mjslbof73dig5y/FreeFileSync_10.24_%5BBeta%5D_Windows_Setup.exe
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vtiger57

hello,

I have send you by email the screenshot of error report in the 10.24 beta.
Hope it can help you.
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Zenju

Looks like we're getting closer. libssh2 is failing with LIBSSH2_ERROR_OUT_OF_BOUNDARY.

Now there are a number of places where this error code is used. Can you test once more with the following version, which will show exactly where this error is originating:
https://www.mediafire.com/file/zlr5xg3xxlek54r/FreeFileSync_10.24_%5BBeta%5D_Windows_Setup.exe
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Joined: 12 Dec 2022

Pepschmier

I am currently having a similar issue when trying to connect to an SFTP Server.
It works fine when using WinSCP and FileZilla.

Was a solution eventually found?