# peer-protocol-mismatch

> Talos next · Since next

the other peer's hello is in another peer protocol (`proto`), or its first message is not a hello this peer can read whole

| | |
|---|---|
| Severity | `error` |

## Meaning

the other peer's hello is in another peer protocol (`proto`), or its first message is not a hello this peer can read whole

## Fix

run every peer on the same engine build; a hello's fields change only with its protocol number