HTTPS / SSL ain't working for the whole network

Hi,

I've got the following problem at one of our customers:
They're trying to access their bank account with an application. Lately, their internet connection got lost. This was at the end of the day, so they just waited for the next day, and the internet worked again, except for the SSL and HTTPS connections. They do not work for any computer in the whole network. Sites like hotmail and logging in to the bank (HTTPS sites) do not work. Also an application that's making connection to the bank via SSL ain't working on any PC on the network. Things I've allready tried:

Connecting a Pc direct to the internet (attaching it to the internet modem).
Disabled the Windows Firewall on the local Pc.

I've checked alot on the internet, there are some people with the same problem, but people only suggest r*tarded solutions as: use firefox. empty cache. uninstall antivirus. But it's nothing of that, it's a network problem, not local.

If anyone has a proper solution, please let me know.
Thanks in advantage.
esa-ngAsked:
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scriven_jCommented:
Most likely to be the router that connects you to the Internet.

First I'd try switching it off for 60 seconds and then turning it back on.
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scriven_jCommented:
So, to elaborate, I am talking about the box that you have referred to as the internet modem (probably an ADSL router).  Basically, start at the phone line, and reset each bit of kit along the way.  Sounds like they are blocking port 443.
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esa-ngAuthor Commented:
It is indeed a ADSL router I was refferring to. I allready had restarted this device, but not for 60 seconds yet. Going to try 60 seconds now.
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esa-ngAuthor Commented:
I tried this, and it did not work. Yesterday I allready tried with the power cable unplugged for 30 seconds. I'm also phoning the ISP right now, to see if they have some suggestions.
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scriven_jCommented:
Can you connect into the router/ADSL modem and check that this is OK?

Also, do you have any internal SSL sites (OWA for instance) that you can connect to, just to take the ADSL modem out of the equation?  Then at least that would narrow things down.

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esa-ngAuthor Commented:
Answere from the ISP:

This is a known issue. They will send a new ADSL router.
Thanks for the help anyways.
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scriven_jCommented:
What ADSL router are you using?

Did you try connecting into the ADSL Router admin console to see if that gives any clue?

There is an interesting article here about testing https sites using openssl - could use this to get an idea of what is going on behind the scenes.

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scriven_jCommented:
Oh - our messages crossed.  Glad you are getting it sorted.
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esa-ngAuthor Commented:
It was the fault of our ISP.
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