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As far as I read zlib compression for sftp transfer is supported by Tectia SSH Server.

In our scenario we would like to access the tectia server using openssh clients which also support compression through zlib. Shell command would be similar to

sftp -o Compression=yes -o CompressionLevel=9 user@tectiassh-server

Are these compression methods compatible to each other?

Thanks for your answer!

asked Sep 15 '11 at 09:17

mal's gravatar image



That command will work without a problem. I tested with OpenSSH 5.8p2 (centOS 5.7)

sftp -o Compression=yes -o CompressionLevel=9 username@server

Thanks, James

This answer is marked "community wiki".

answered Sep 16 '11 at 15:30

jamesw's gravatar image


edited Sep 16 '11 at 15:30

Thanks for your answer. I also found out that no error is thrown if I try to connect. I'm also able to transfer files and so on. But I do not think that there is actually data compression ... I did not noticed a significant change in transfer rate.

I have checked it against openssh client + openssh server transferring files with a gzip compression ratio of 90% where I noticed a performance boost.

I assume that the negotiation during connect might fail... and compression is turned off. That’s why I asked if the compression is compatible (and working).

(Sep 16 '11 at 17:15) mal mal's gravatar image

Hi mal, what version of Client and Server are you using?

(Sep 16 '11 at 18:31) Roman ♦♦ Roman's gravatar image

Hi Mal,

You are correct. There was indeed a bug in earlier versions (5.0-6.1.7) of Tectia Server where compression was not actually used even when requested by the client. This was fixed in version 6.1.8 and above of Tectia Server. Which version are you using?


answered Sep 16 '11 at 20:21

Roman's gravatar image

Roman ♦♦

We are using Version 6.1.6. We will try to update

Thanks so far, Martin.

(Sep 19 '11 at 12:27) mal mal's gravatar image
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Asked: Sep 15 '11 at 09:17

Seen: 7,177 times

Last updated: Sep 19 '11 at 12:27

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