SSH Private Key

Hi All

I am setting up an new SFTP domain and wish to use higher key length (2048)

I have created an SSH Private key with 2048 Key length and save the key file and configured as per article Configuring Serv-U For SFTP Access

When I save the Config I can see the SSH fingerprint in the resulting screen

However when I connect with WINSCP, I can see that the fingerprint Warning is still using the default 1024 key that seams to come with Serv-u

Any idea how to ensure that clients use my 2048 key?

Thanks