That could very well be... could even be a company policy that they have set on all the computers (have you tried other computers at your workplace?)

In any case at work I wouldn't push the issue in case they don't like the idea of you trying to log in here from work. Even if you only do it during breaktime or lunch or after punching out... a lot of companies don't like outside access anyway because employees could be using it for activities that aren't the most clean... and it exposes the company to damages. Easiest for them to just lock out all outside access except authorized sites in order to protect themselves.

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