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MSN "Key Ports" intermittent failure


MSN "Key Ports" intermittent failure

I have an intermittent fault which happens several times a day amd tends to last for only a few minutes. It has been going on since August - and Plusnet support is being singularly unhelpful.

Fault is that MSN disconnects INTERMITTENTLY - the MSN line tester says it has lost "KEY PORTS"; IE stops working BUT POP3 continues OK. HTTP stops working. Then suddenly all is fine....

This fault is unique to this site - it DOES NOT OCCUR at my other site with the same laptop. It occurs on multiple PCs at this site - wireless and wired.

There is no site firewall or proxi server - it uses a zoom X6 ADSL modem / wireless router.