FTP SSL connections errors out

I'm getting the following error when connecting to a SSL enabled FTP server:

[07:52:19] 220 (vsFTPd 2.0.5)
[07:52:19] AUTH TLS
[07:52:19] 234 Proceed with negotiation.
[07:52:19] Connected. Exchanging encryption keys...
[07:52:20] Session Cipher: 168 bit 3DES
[07:52:20] TLS encrypted session established.
[07:52:20] PBSZ 0
[07:52:20] 200 PBSZ set to 0.
[07:52:20] USER ECW\username
[07:52:20] 331 Please specify the password.
[07:52:20] PASS (hidden)
[07:52:20] SSL/TLS internal error (Error = 0x95ba95a3).
[07:52:20] The token supplied to the function is invalid
[07:52:20] The token supplied to the function is invalid
[07:52:20] Client closed the connection.


server side: vsftpd with SSL enabled. I don't see any errors in the logs on the server end

Thoughts?