My tenants cannot access some HTTPS: websites

Hey all,

I rent out a house to 6 tenants and provide them internet as part of their service. They have recently had trouble accessing secure HTTP sites like Paypal and Online Banking sites.
The sites they can and can't access are different for each person and their laptop.

I have spoken to my broadband provider and they cannot see anything wrong with the service. I took my laptop around and experienced the same issue where I couldn't get onto the secure Paypal website.

I am at my wits end with this problem! I have been trying to fix it for the past 3 weeks. Tomorrow I am going to swap out the router but I seriously doubt that this is the problem.

Any ideas of what the problem could be?

Many thanks in advance!  
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Could be the router's settings.  DNS is not working, or is directed to a bogus server.  Check that first.  Choose a "neutral" DNS server like from GTE/Verizon.  That will avoid the DNS hijacking done by some ISPs in-house DNS servers that they use for residential customers.  Ironically, Verizon FiOS service uses a hi-jacking DNS server (redirects to their own search site instead of "not found").

Also, turn of uPnP (unplug-and-play), or you're allowing any computer that connects to make alterations to the firewall.

Can you ping the sites?  What comes back as the IP address?  Are they correct?
your tenants might have a virus which prevents them from accessing the websites that they want too... make sure this is not the case.
Don JohnstonInstructorCommented:
Are there different failures for each PC? For example: Can PC 1 resolve PayPal but PC 2 can't? Or is the inability to resolve a domain name affect all PC's?
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bpsp10Author Commented:
Some PCs cannot access Paypal, some cannot access other secure websites.

The problem sites are not common (although Paypal is especially common amongst them) but they are all experiencing a problem with HTTPS of some sort or another.

Don JohnstonInstructorCommented:
Do all PC's have the same DNS server?

If they have different servers, then see if the problem moves with the server.

If everyone has the same server, then the problem is specific to the PC. I would check to see if the hosts file has any bogus entries.
bpsp10Author Commented:
I ended up changing the router to a new router and so far this has resolved the problem

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bpsp10Author Commented:
Worked out the answer on my own
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