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Internet Related/Filtering/Firewall Thread, ISA Server issues in Technical; Some time on Friday we found we'd lost a few services - Offsite SIMS backup, SMTP mail to external addresses ...
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    Gibbo's Avatar
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    ISA Server issues

    Some time on Friday we found we'd lost a few services - Offsite SIMS backup, SMTP mail to external addresses and LogMeIn. Web is fine though.

    We've not done anything to our ISA box so I can't understand what's happened.

    Any ideas? Sorry I'm being so vague, but I've not used ISA server before.

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    SYNACK's Avatar
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    Restarted it, added any updates?

    Anything or anyone upstream like your ISP tweak anything. ISPs sometimes do dopey things in the name of percived security.

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    I agree. Sounds like someone's closed all the open ports on an upstream firewall, leaving open just 80 & maybe 443. I'd be phoning my ISP if I were you.

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    It seems to be a proxy authentication issue. If I put a username and password into any proxy config boxes (such as Logmein) it works.

    We've put Proxifier on and added the mail server IP to it and that also works now, but can't be a permanent fix for obvious reasons.
    Last edited by Gibbo; 21st November 2011 at 08:27 PM.

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    Did you manage to fix this?

    If not, then do your users usually have to authenticate against the ISA server? Is you internet connection using a transparent proxy?

    Last summer our ISP changed, and our connection changed from a transparent proxy to a non-transparent proxy, and all of a sudden all computers needed to use the ISA server as an explicit proxy server rather than just using it as a default router. This change meant that programs such as you mention needed a proxy set. Our pupils need to authenticate using integrated authentication (so they are not aware they are authenticating), whereas the staff connection is anonymous.

    Whether you force authentication against the ISA server or allow anonymous connections is set up within the ISA configuration.

    If possible I'd try to put a computer upstream to the ISA server and see if the responses you get are as expected.

    Hope this helps!
    Last edited by digone52; 26th November 2011 at 09:52 PM.

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    No, still not managed to sort it. And now students get a popup box asking for username and password when they try and go on the web.

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