Has anyone heard of this problem and how to fix it?

CentOS + Plesk 7.5.2 reloaded ...

Using oscommerce store for ecommerce.

Customer goes to site, clicks on the online store link and gets a download box using IE and cannot access the store...also happens using some versions of netscape.

It doesn't happen on all IE browsers with or without the xp2 patch.

Firefox works without any problems all the time as does xp2 patched IE browser.

Doesn't matter if the browser cache is cleared or not.

Any help is greatly appreciated.

 

Sounds like an SSL issue.

Check that your SSL certificate is a valid one.