ICQ, Pidgin authorization?

Question

Computer networks

I log out of Pidgin with the account I use ... 10 years.
On the computer where this account was used (everything was saved earlier).
No connection:

Wrong password

Server: login.icq.com
Port: 5190
Once upon a time, this has already happened ...
Why are they doing something weird again? changed protocol?
Who uses ICQ - what do you have?

Answer 1

Cannot validate certificate
The certificate for slogin.icq.com could not be validated. The provided certificate chain is invalid.
What does this mean?
(where everything worked for years)

Answer 2

If the matter is in the certificate, then this sometimes happens. They got drunk, drank money, forgot to renew the certificate (in Mail.ru, which now owns ICQ). You need to temporarily disable certificate verification and / or switch to an insecure connection (disable SSL).