In July 2025, Box will disallow FTPS connections that use weak CBC-mode ciphers for SSL. This change is to ensure the continued security and integrity of Box and our customers’ use of Box. The affected ciphers are:
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TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
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TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
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TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
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TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
We encourage all customers using weak ciphers to upgrade their FTPS clients to use stronger SSL encryption ciphers.