Hello, We are using Serv-U 15.1.1.108 and have a client trying to connect to our SFTP server using Core FTP LE v2.2 build 1819. Every time they try to connect, we see in the logs...
[31] Wed 10Feb16 11:06:20 - (003060) SSH Protocol Error: unable to choose cryptos.
[02] Wed 10Feb16 11:06:20 - (003060) Closed session
I found where "unable to choose cryptos" means that Serv-U and Core FTP LE don't have a compatible cipher they can both use to encrypt the connection. I sent the client a screen shot of what Serv-U has for ciphers and they sent me a list of the three Core FTP LE has, which are on Serv-U's list. We tried changing the Core FTP LE order in which the ciphers are tried, but that didn't help. We've had problems with Core FTP in the past, but that client was able to switch to FileZilla. This client can't. If anyone has any suggestions on what might be causing this and how to fix it, they would be appreciated.