olemus
alaline viga, andmete või toimingu järjestikku kasutamiskatsetel alati kordub
= persistent error, always repeated in successive attempts to use the data or the operation

näiteid
https://www.emailmanager.com/en/blog/12/1951/see-the-difference-between-temporary-and-permanent-errors-in-email-marketing.html

https://link.springer.com/content/pdf/bfm%3A978-1-4614-0962-5%2F1.pdf