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---
sidebar: reference
---
# Validation plugins
A validation plugin is responsible for providing the ACME server with proof that you own the identifiers
(host names) that you want to create a certificate for. The
[ACMEv2 protocol](https://tools.ietf.org/html/draft-ietf-acme-acme-18) defines different challenge types,
two whom are supported by Let's Encrypt and win-acme, namely [HTTP-01](/win-acme/reference/plugins/validation/http/),
[DNS-01](/win-acme/reference/plugins/validation/dns/) and
[TLS-ALPN-01](/win-acme/reference/plugins/validation/tls-alpn/).
For wildcard identifiers, only DNS validation is accepted by Let's Encrypt.
Other challenge types are not supported for various reasons:
- `TLS-SNI-01/-02` - deprecated and removed
- `PROOFOFPOSSESSION-01` - unknown
## Default
By default, the [self-hosting plugin](/win-acme/reference/plugins/validation/http/selfhosting) is used.
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