SourceTree error: The server's host key is not cached in the registry.

[Markus_Bonn]

In a brand new installation of SourceTree on a brand new WIndows 10 I am getting and error for push/pull/fetch etc :

git -c diff.mnemonicprefix=false -c core.quotepath=false fetch origin
The server's host key is not cached in the registry. You
have no guarantee that the server is the computer you
think it is.
The server's rsa2 key fingerprint is:
ssh-rsa 2048 aa:d1:aa:00:bb:c0:b0:a0:d0:e0:f0:a0:a1:00:11:ee
If you trust this host, enter "y" to add the key to
PuTTY's cache and carry on connecting.
If you want to carry on connecting just once, without
adding the key to the cache, enter "n".
If you do not trust this host, press Return to abandon the
connection.

A solution to this is described here:

https://confluence.atlassian.com/sourcetreekb/trust-a-server-s-host-key-when-no-button-is-available-to-trust-it-788731545.html

But this does not resolve the problem. The solution offers two workarounds:

1) "Just get SourceTree to use Embedded Git and get it to trust the host"

When I do this I am not prompted to trust the host. It simply switches to Embedded without any more messages or confirmations.

2) Run the command

"C:\Program Files (x86)\Atlassian\SourceTree\tools\putty\plink.exe" bitbucket.org

When I do this, I am indeed prompted to trust the server. After I enter yes, I am prompted for a login. I have no idea what to enter here. But any login I can imagine, such as for my bitbucket account fails :

FATAL ERROR: Disconnected: No supported authentication methods available (server sent: publickey)

BTW, the command line versions of the git commands work fine

Any help in this matter would be appreciated.

[Marvin.Nachatelo]

For others that may be having the issue, this is how I was able to get past it.

I was able to correct this by downloading and installing putty onto my windows 10 laptop.  I then made a connection to my git server and answered the question with a yes.

Marv