if you use watchguard firewalls and you use the http proxy for outgoing connections, you can have problems with opening pdf's in internet explorer.
To solve this issue open the wathcguard policy manager.
Click on "setup" in the menu and select for "actions" and choose for "proxies".
Double click on the http client proxy policy.
in the section "HTTP response" select "content types".
pres the add button on the right side of the window.
in the "rule setting" section choose for "exact match" and type in the textbox "multipart/byteranges"
in the "action" section choose for "AV scan" and press the "OK" button.
Save the config and from now on you can pdfs in the internet explorer screen.
you arent the sysadmin of the watchguard?
right click the pdf and save the pdf first on your desktop or install foxit pdf reader (wich is a smaller but faster pdf reader)
