I once had a slightly similar problem (and solved it), but
it had nothing to do with Tex -- it was purely an internet
connection problem. There was a website (the humor magazine,
"The Onion") which I was able to connect to from my office
but not from my home computer.
I eventually discovered (I don't remember how) that my home
computer had in its Windows directory a textfile named
"hosts" (not "hosts.txt", but just "hosts", with no period
or extension). It included some names of websites and some
IP addresses. For "www.theonion.com" it had an incorrect
IP address. I don't know exactly how that file gets
constructed or what it does, but I could see that it
contained an erroneous line. I deleted that line
from the textfile and the problem disappeared.
Philip G. Ratcliffe wrote:
> I have a slightly different, but not entirely unrelated problem.
> At work (an Italian university on the main Garr-B network) I have absolutely
> no problems in updating etc. However, at home with the same (and another)
> machine, through my ISP (Tiscali), over an ADSL connection, for something
> like a year now I am unable to update or even simply connect to the
> miktex.org site; I get "site unavailable" error messages (that is, e.g., on
> trying to update, the wizard is unable to download the package repository
> list). I never have (or have had) this or even a vaguely smilar problem
> with any other site I visit or use.
> Does anyone have any idea what might be going on?