I am having trouble connecting to my wireless internet. I keep getting message that my network configuration settings have changed. Ive been advised that i need to change settings to look for dynamic ip address ?

I am having trouble connecting to my wireless internet and am getting the message that my network configuration settings have changed. I have reported it to my provider who advised that they think the Mac is looking for a fixed IP address and they use dynamic addresses. I have had the Mac for months and have not had this problem before. I would appreciate any help please on how to fix this ?

Then I get a separate pop up that says: Secure Connection Failed. aus3.mozilla:443 uses an invalid security certificate.
The certificate is only valid for the following names: securelogin.arubanetworks.com, www.securelogin.arubanetworks.com
(Error code: ssl_error_cert_domain)
This could be a problem with the server's configuration or it could be someone trying to impersonate the server.
If you have connected to this server successfully in the past the error may be temporary and you can try again later.
I have tried many many times!

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