Certificate error

[pinokio1]

Koristim Joomla 2.5.8. Od pre dva dana kada probam na sajtu (korisnički deo) da se ulogujem sa administratorskim korisničkim imenom i šifrom otvara se stranica sa naslovom "Certificate error" i na njoj je sledeće obaveštenje:

There is a problem with this website's security certificate.
The security certificate presented by this website was not issued by a trusted certificate authority.
The security certificate presented by this website was issued for a different website's address.
Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server.
We recommend thThere is a problem with this website's security certificate.
The security certificate presented by this website was not issued by a trusted certificate authority.
The security certificate presented by this website was issued for a different website's address.
Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server.
We recommend that you close this webpage and do not continue to this website.

Kada kliknem na "continue to the page" pojavi se greška 404: IE cannot find this web page.

Ranije je sve bilo u redu. Ovo mi se dešava od pre 2-3 dana. Ne znam gde sam zabrljao. Molim Vas da mi pomognete.
Inače, u administratorski deo se logujem bez problema. Sajt (korisnički deo) takođe funkcioniše dobro dok ne probam da se ulogujem.