Connectrix B-Series: The Web Browsers Report "Cipher Mismatch, No Matching Ciphers" When Accessing WebTools UI Using HTTPS
摘要: AES256-SHA256 (0x3d) and AES128-SHA256 (0x3c) is blocked for TLS.
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症狀
The web browsers (Chrome, New Edge, or Firefox) refused to open the WebTools using HTTPS.
The error message contains "Cipher Mismatch" or "No Matching Ciphers."
Figure 1: Screenshot of Error Message Showing Connection Not Secure, Unsupported Protocol
The switch is running in FOS 8.1 or 8.2 firmware.
The error message contains "Cipher Mismatch" or "No Matching Ciphers."
Figure 1: Screenshot of Error Message Showing Connection Not Secure, Unsupported Protocol
The switch is running in FOS 8.1 or 8.2 firmware.
原因
The switch HTTPS cipher setting only allows AES256-SHA256 and AES128-SHA256 for TLS 1.2 (the "default_generic" or "default_strong templates" of FOS 8.1 or 8.2).
The Wireshark dump shows that the client does not accept AES256-SHA256 (0x3d) or AES128-SHA256 (0x3c), hence the TLS handshake fails.
Figure 2: Screenshot of Wireshark Dump Showing Handshake Failure
<switchname>:root> seccryptocfg --show | grep HTTPS HTTPS : !ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!AESGCM:!SSLv3 HTTPS : TLSv1.2 <switchname:root> openssl ciphers -v '!ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!AESGCM:!SSLv3' AES256-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA256 AES128-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA256
The Wireshark dump shows that the client does not accept AES256-SHA256 (0x3d) or AES128-SHA256 (0x3c), hence the TLS handshake fails.
Figure 2: Screenshot of Wireshark Dump Showing Handshake Failure
解析度
Modify the switch HTTPS cipher setting to cover the client.
Example:
In this example, the current HTTPS cipher setting is "!ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!AESGCM:!SSLv3"
To enable AES256-GCM-SHA384 (0x9d) and AES128-GCM-SHA256 (0x9c), remove "!AESGCM" from the setting with the command:
Example:
In this example, the current HTTPS cipher setting is "!ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!AESGCM:!SSLv3"
To enable AES256-GCM-SHA384 (0x9d) and AES128-GCM-SHA256 (0x9c), remove "!AESGCM" from the setting with the command:
seccryptocfg --replace -type https -cipher '!ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!SSLv3'
其他資訊
Map OpenSSL cipher names (displayed in the OpenSSL command) with IANA cipher names (displayed in Wireshark dump) using the Mozilla document, Security/Cipher Suites - MozillaWiki
受影響的產品
Connectrix B-Series文章屬性
文章編號: 000213633
文章類型: Solution
上次修改時間: 18 5月 2026
版本: 6
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