Weird IE11 issue with Proxy.pac file RRS feed

  • Question

  • Hi there,

    Tearing my hair out with one.

    Symptom: Internally hosted website does not display – no error, nothing apart from a blank grey screen.

    Our setup:

    We use a proxy.pac file to direct external traffic through the proxy and all local traffic to return direct.

    We have one internal website that uses a port number in the URL which has the problem, all other sites are fine e.g.

    Using no proxy or using the proxy direct works fine. So it is a problem with the .pac file not the proxy itself (shouldn’t be using it anyway).

    Bizarrely Chrome and Firefox both work perfectly well using the pac file with this website, its only IE that has the problem and the problem affects every machine with IE.

    I amended the pac file to include

    isInNet(dnsResolve(host), "", "")

    in addition to

    isInNet(dnsResolve(host), "",  "")

    But it made no difference, what am I missing here?

    Why is it only IE that has an issue?


    Monday, May 7, 2018 2:15 PM