Looks like one thing that results in this message is

Tunnel errors that happens only once we connect to the local port (server-side forwarding problems). Contrary to local side problems handled already in OpenTunnel.

https://github.com/winscp/winscp/blob/6.3.3/source/core/Terminal.cpp#L1554
NET_TRANSL_CONN_ABORTED is "Network error: Software caused connection abort"
https://github.com/winscp/winscp/blob/6.3.3/source/core/SecureShell.cpp#L1564

Based on that, it looks like its solved by connection or server side stuff.

I'd guess based on the short reply that it might have been a blip and solved without anything done by the user. Either that, or they're one of those that likes to leave it as a mystery :)

How this issue got resolved, share the steps

Now working

HI Support

I've provided the attached log depicting an error

Network Error : Software caused connection abort

While previously it's been connecting fine (been connecting daily to this connection) for year now.
The WinSCP software is up to date @ version 5.21.7
The PC is running Windows 10 OS on our corporate network.
I have even removed the local AV software on their to see if that was blocking.
I have confirmed with our ISP that the WAN Firewall is allowing traffic through so the issue is not at their end.
I can however connect to this from my home PC, outside the corporate network but as I say the ISP has confirmed it is being allowed no problem, so related to Host/software issue it seems
Help??