Problem telneting to a new -current

Hello,

After upgrading a test system from -current at August 18, to -current at
September 21, I can no more telnet to it from a releng_6 system (from a
console and/or a xterm).

The user/password dialog takes place, and I get the system banner
(FreeBSD/i386 ...), then the connection is closed by the host.

Thanks for your attention

Claude Buisson