error message

When I try to go to Wikipedia (using Ice Dragon on this computer), I get this message (for the past several hours): An error occurred during a connection to www.wikipedia.org. The OCSP response is not yet valid (contains a date in the future). Error code: SEC_ERROR_OCSP_FUTURE_RESPONSE

But I don’t get this message when I use Opera or Ice Dragon on another computer. I have no problems on those two browsers with the pages loading.

Thanks.