Category Archives: Proxy

The IT Detective Agency: Cisco Jabber stopped working for some using WAN connections

Intro This is probably the hardest case I’ve ever encountered. It’s so complicated many people needed to get involved to contribute to the solution. Initial symptoms It’s not easy to describe the problem while providing appropriate obfuscation. Over the course … 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: the case of the Sales and Use tax software

Intro I have to give credit to my colleague “Ben” for cracking this case, which left me scratching my head. Users at drjohns were getting new Windows 7 PCs and some of the old software wasn’t going to run on … Continue reading

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The IT Detective Agency: intermittent web page not found error

Intro One of the high arts of IT is system integration, and an important off-shoot of this is acquisitions. We are involved in integrating a new location, which, unfortunately, we do not yet have full access to. The local networking … Continue reading

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