application error to connect yahoo

i use emclient since 3 months , last 15 days ago
it works always
today i use 2.7 and 2.6 version but i don’t connect to yahoo server
ping works regularly
tested 2 yahoo accounts
returned error : an attempt to connect to … failed ! Please check configuration

The issue is that yahoo changed their connection settings. The fix will be available with the next release. Meanwhile change your yahoo account settings according to the screenshot below.

i tried that and i get an server says “unauthorized”

In most of the cases is this issue caused by Yahoo server but to prove that, we need more information - send us your CalDAV logs and I will be able to tell you more. Thank you.