FileZilla Forums

I use FZ (current version 3.53.0, 64-bit) to transfer files up/down from my account with Box.com. I've made such transfers almost daily, for years, with nary an issue -- until today. No changes to settings , but now, when I try to access my Box.com account, using implicit FTP over TLS, I get the following pop-up error:

"This server does not support TLS session resumption on the data connection.

<bunch of stuff about why this is important>

Host: ftp.box.com
Port: 990

Then a checkbox asking if I want to allow insecure data connection for this server in future sessions.

I'm puzzled by the sudden appearance of this error message, and, if I ignore it, don't check the 'check box', and proceed, looks like I have a completely secure connection (Protocol TLS1.2, Cippher AES-256-GCM, Key Exchange ECDHE....).

Suggestions? Comments?

Many thanks in advance...

Well, one *big* clue. I downgraded from 3.53.0 -> 3.52.2, and presto chango, the problem disappearred.

So, seems as if *something* changed with the update to 3.53.0 that causes FZ to no longer 'play nice' with Box.com.

Wrong. The problem is always there, it just happens that FileZilla 3.53.0 is the first version to actually report it. In other words: The connection was always less-than-secure, you just were unaware of it.

The issue must be solved by box.com (by finally supporting that important security feature).

Interesting. Thanks for the information.