I have a user with a home laptop trying to reach our Exchange server via the Outlook web client. Using IE 8 or 9, or the latest Firefox the site times out when the notebook is connected wirelessly. It can browse any other site with no problem. If I connect an Ethernet cable it connects immediately.
I've turned off the firewall, added the site to trusted sites, and made sure the machine (Win 7 Home Premium) is fully patched and updated. No sign of any malware or other infection.
This is has been tried from their home network and our work network. All other systems connect to the site with no issues. The site is a secure site and no certificate errors appear.
What am I missing?