Hi,
since 3 days I'm experiencing a quite annoying problem on two Win7 64bit PCs at home.
Randomly (time to time), it is no longer possible to browse the web, or the connection gets really slooow.
Few details about the investigation done:
- It is not from the ISP. When one of the two PCs is blocked, others are perfectly working (Win8 w/o NIS & Android tablets)
- It is not the DNS resolution. If on the blocked PC I nslookup a name, it is resolved istantly
- It is not the router. I restarted it but problem persists
- it is not the network interface. Only web browsing is blocked, all other activities (mail, skype, gaming...) works perfectly
- It is not the web browser. When blocked, any browser installed (Firefox, Chrome, IE9) is blocked the same way
Looking at NIS log file, I do not see particular errors highlighted, and NIS firewall configuration has not been changed... The only entry I see as new since 3 days is a warning about IP addresses appearing and disappearing on the Teredo Tunneling (I never had this message before). Given that, I disabled the ipv6 protocol to stop the tuneling, but web got blocked again so Teredo Tunneling is not the culprit. To note, IPv6 is not enabled on my modem.
Given only web activity looks affected, I tried to disable NIS web protection when browser was stuck, but it did not help to recover the situation. Disabling the firewall did not help too.
To note: when web browser is stuck, it is blocked on any user on the PC... the ones surveilled by Norton on Line Family and the ones not surveilled; the ones with admin rights and the ones w/o privileges.
As last resort, on one of the two PCs I restored a disk image saved before having the problem, to be sure it is not a problem of Windows patches (there has been some installed recently). Now the only different with the past working image is NIS, that of course updated immediately to the latest definitions and patches.
Any suggestion is welcome
Thanks,
Giorgio
NIS version is 20.3.0.36
Win7 SP1 has all latest patches installed (-IE10 I refused)