We have an FTPS server (Passive FTP mode) that uses a self-signed SSL certificate, with several external clients using the server successfully.
We have a new client who states they cannot connect. I can log in as this new client from my location, We both get to the point in the connection process where the session log reads--
AUTH TLS
234 Proceed with negotiation.
At this point when I connect as them, I get the dialog box asking me to accept the SSL cert. When I accept it, I get
TLSv1, cipher TLSv1/SSLv3 (DES-CBC3-SHA) - 168 bit
USER [redacted]
331 Please specify the password.
PASS **********
230 Login successful.
They sent me a screenshot of their client and it is configured exactly like mine, but they say they are never seeing the cert acceptance box. They get--
Error reading secure data from the server.
No response from server...
I do not believe it is a "non-standard port" firewall issue because the client never gets to the point in the login process of issuing the PASV command and switching to the secure data port. They just don't get the "Accept Certificate" box.
Any ideas?
Thanks in advance.
Larry