When I execute a download file (skype download, for example) a message appears saying internet connection isn´t available, even tough it work properly

when I execute a download file (skype download, for example) a message appears saying internet connection isn´t available, even tough it work properly

I'm having the same problem with this, only it happens with all add ons. I get error -228 when I try, every time.
I can't install through the add-on manager, from the add on site, or by saving the link on the site. I've tried downloading it in Firefox, Chrome, and IE to no avail.
I can, however, drag existing .xpi files into the add on manager and they will install just fine.
I've looked through all the available other documentation, including the two links suggested by TXGuy above and none of it has helped.

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