Tag Archives: PAC file

F5 BigIP irule: serving a dynamic proxy PAC file

Intro A large organization needed to have considerable flexibility in serving out its proxy PAC file to web browsers. The legacy approach – perl script on web servers – was replaced by a TCL script I developed which runs on … Continue reading

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The IT Detective agency: Outlook client is Disconnected, all else fine

Intro Today we were asked to consult on the following problem. Some proxy users at a large company could not connect to Microsoft Outlook. Only a few users were affected. Fix it. The details Affected users would bring up Outlook … Continue reading

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The IT Detective Agency: The case of the purloined packet

Intro Someone in the org notices that laptops can’t connect to our VPN concentrator when using Verizon MiFi. An investigation ensues and culprits are found. Read on for the details… The details Some background The laptops are configured to use … Continue reading

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The IT Detective Agency: Browsing Stopped Working on Internet-Connected Enterprise Laptops

Intro Recall our elegant solution to DNS clobbering and use of a PAC file, which we documented here: The IT Detective Agency: How We Neutralized Nasty DNS Clobbering Before it Could Bite Us. Things were going smoothly with that kludge … Continue reading

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The IT Detective agency: Excessive Requests for PAC file Crippling Web Server

Intro Funny thing about infrastructure. You may have something running fine for years, and then suddenly it doesn’t. That is one of the many mysteries in the case of the excessive requests for PAC file. The Details We serve our … Continue reading

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The IT Detective Agency: the case of the Adobe form network issue

Intro Sometimes IT is called in to fix things we know little or nothing about. We may fix it, still not know anything, except what we did to fix it, and move on. Such is the case here with a … Continue reading

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The IT Detective Agency: How We Neutralized Nasty DNS Clobbering Before it Could Bite Us

This gets a little involved. But if you’re the IT expert called on to fix something, you better be able to roll up your sleeves and figure it out! In this article, I described how some, but not all ISPs … Continue reading

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