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Usage of WinSCP in SCP mode may results in massive and rapid memory consumption by sshd on 11.4 SRU26 (Doc ID 2742235.1)

Last updated on JANUARY 07, 2021

Applies to:

Solaris Operating System - Version 11.4 to 11.4 [Release 11.0]
Information in this document applies to any platform.

Symptoms

When WinSCP is used in SCP mode, transferring a large file (eg: 170MB) results in the sshd daemon consuming all memory within minutes.
File transfer throughput appears to start normally but then quickly drops to a very low rate - presumably the transfer is stalled on the Solaris sshd requesting memory.

If WinSCP is used in SFTP mode this issue does not occur, and transfer completes normally.

 

Changes

Ssh version has been updated to OpenSSH_8.1p1

Cause

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In this Document
Symptoms
Changes
Cause
Solution

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