The remote host is missing an update to curl announced via advisory DSA 2398-2.
cURL is a command-line tool and library for transferring data with URL syntax. It was discovered that the countermeasures against the Dai/Rogaway chosen-plaintext attack on SSL/TLS (CVE-2011-3389, BEAST) cause interoperability issues with some server implementations. This update ads the the CURLOPT_SSL_OPTIONS and CURLSSLOPT_ALLOW_BEAST options to the library, and the - --ssl-allow-beast option to the curl program.
For the stable distribution (squeeze), this problem has been fixed in version 7.21.0-2.1+squeeze2.