Website Security Certificate issue on domain

[BBrian]

When users try to visit a site, http://www.esinet.ie, they're getting an error: There is a problem with this website's security certificate. It's the same in IE, Firefox and Chrome. Firefox tells me the certificate expired in September. I was testing in a VM that had never visited the site before and there's no proxy in the school.

 

When I visit using my own laptop, i.e. not joined to the domain, I can view the site without problems and the certificate is still in date.

 

I went into WSUS and made sure everything IE/Root Certificate related was approved and the computers have run Windows Update, but this didn't fix it.

 

I had a look in Internet Options/Content/Certificates but didn't see anything that looked unusual. Does anyone know what's going on?

[pete]

I also get that the cert has expired. Firefox and Chrome.

 

Since it's a government website, I'd lean towards the "they've messed up" explanation if .ie is anything like .uk where they don't notice until someone pokes them with a stick.

 

Is it load-balanced? That may also explain a good cert / bad cert mishmash.

[Ergo]

Just looked and the certificate looks good when I connect (FF11):