Australian Eurovision fans are seething after an error with the official SBS voting line sent the system into meltdown and meant some Australian votes went uncounted or weren't received.

Australian viewers were given the chance to vote in the European Song Contest for the first time as part of Australia's one-off wildcard entry, but many fans who woke up early for the live 5am grand final broadcast were excluded from voting.

Fans trying to vote for their favourite countries received error messages telling them voting had already closed or the service they requested was unavailable.