| Description |
This article describes the unsupported protocol during HTTPS access: ERR_SSL_VERSION_OR_CIPHER_MISMATCH |
| Scope | FortiGate. |
| Solution |
The issue appears when a user is trying to get HTTPS access to FortiGate even if HTTPS and SSH access is allowed on the port.
Error code: ERR_SSL_VERSION_OR_CIPHER_MISMATCH
This error occurs when the client and server do not support a common SSL protocol version or use an old TLS version.
Related document:
To check the TLS version configured in the FortiGate use the below command:
# sh full system global | grep tls set admin-https-ssl-versions tlsv1-1
Config admin-https-ssl-versions to support more TLS protocols
# config system global set admin-https-ssl-versions tlsv1-2 end
It is possible now, to try to access the GUI again:
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