Problem with file copy using Solarinds SFTP & SCP Server

We have been experiencing this for some time as well.  No solutions.

I have the same issue, it stops the service on my windows 7 32 bit VM.

I did wireshark  and the transfer starts off rather quick and then the TCP window updates start happening. the  transfers slows to a crawl and then the SCP server resets the TCP connection to the router  for some reason.

I am not forcing any modulus ( though I created a key with 4096 )  and even replicated in a lab environment.

The SCP server is from 2013 and i don't see any update on this forum or others this has ever been resolved.

Has anyone found a solution to this problem?  Cisco seems to be using larger file sizes these days and my SFTP server is producing the same error.

I was having a similar problem managing an ISR4321 that is connected through a VPN tunnel.  I was getting a different error "invalid argument" but that could be differences in IOS versions.

After checking the basics on the Orion SCP/SFTP server:

1. Service is running.
2. Firewall rule enabled.
3. Authentication configured or disabled.

I had to configure the source-interface on my router so it would source traffic from a tunneled interface.

conf t
 ip ssh source-interface Loopback0
end

Then I was able to SCP from the router back to the server.