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P4 Server Administration Documentation | 2025.2

# Server and client setup

By default, a P4PORT setting that does not specify a protocol is assumed to be in plaintext. It is good practice to configure P4 client applications to explicitly specify the protocol to use when establishing a client-server connection.

plaintext | ssl
--- | ---
`tcp:host:port` | `ssl:host:port`
`tcp:123.45.67.8:1666` | `ssl:123.45.67.8:1666`
| The first time that users connect to an SSL-enabled P4 Server, their client application informs them of the certificate fingerprint of the server’s identity key. If users can independently verify that the fingerprint is accurate, they should add the server to their `P4TRUST` file by doing one of the following: using the `p4 trust` command following the prompts in the client application manually adding the fingerprint to the file Consider the alternative of SSL connections that do not require P4TRUST, which is described in the `p4 trust` topic of P4 CLI Reference.

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