I recently installed an Exchange 2010 server at this time coexistence with 2003. It has been up and running for about 2 weeks. Everything with my certificate is fine, including autodiscover. I have several users who telecommute and take their laptops home. Everything has been working fine, but for some reason starting today, when they try and access their email from home through our company's VPN, they are getting the autodiscover popup box asking for their password. The only thing that I know that is going on is that our ISP have been working to get our DNS reverse PTR record fixed.
How can I fix this issue?