By this time, you are probably aware that my picture manipulation skills are less than par, but if you take a quick look at the image on this article, right below the MAC address, I placed a small refresh icon. Weird as it may seem, I do have a valid reason for having done this to a network adapter. However, I am getting a bit ahead of myself, so let me take a quick step back. A few days ago, HTC and Microsoft started pushing out build 7740 to their WP7 line of devices (Schubert, Mozart, etc) in order to bring their builds up directly to Mango, which happens to be a really good improvement from the NoDo release. Well, as most releases from Microsoft, this one is not without its bugs. Shortly after the update a few users started noticing something weird regarding their internet connectivity via Wifi. A lot of these people use a security measurement for their wifi networks that is called MAC filtering, which basically will not let any computer/wireless device with a MAC different from the ones registered to access the network or the internet. As it turns out, the update has a bug in the ICS (no, not Ice Cream Sandwich, but Internet Connection Sharing) feature that essentially resets the MAC address of the device after the device gets rebooted.
There are several confirmed cases of this being a bug and it seems that while not an excruciatingly bad issue, it is something that HTC may want to look into as it affects most of (if not all) of the most recent updates being released/pushed. Again, if you don’t use WiFi connections an awful lot, then you likely have nothing to worry about, but this can be an annoyance for people who need to register their devices with a network administrator prior to being able to surf the web.
If you are experiencing this issue as well, please make a post in the proper thread (link before) and we will try to put HTC on alert so that they can take the proper actions on this to get it fixed.
Just updated my HD7 to the update with internet sharing. After this, I can confirm that every time I reboot my phone, I get a new mac address.
You can find more information and testimonies in the original thread.
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Thanks xHausx for the tip!_________