The problem with traditional firewalls is that they leave port 53 open, which is for DNS queries.

I'm not sure where to ask this kind of question now but I'm really getting frustauted because it's Sunday and the provider off for today. I'm using LinkSys WRP400 and the problem I had is that I can't connect to some of the website while I can connect it with other network [My iPhone in the 3G network] or I even tried use the cable to connect and it works When I use the LinkSys the thing when I visit the website that I usually visit daily and few more saying connection timeout. I did setup google DNS as well and it doesn't help So I figured that the problem coming from LinkSys itself but I did reset to manufacture and the problem still exist Is there anything I can do to clear cache or whatever solution Or I just have to wait for the provider only?

You didn't say what kind of device you have or what operating system it's running so it's impossible to tell you this. In general you would find this somewhere under network settings. If you want something more specifically use whatever you use to search the internet (Bing, Google, whatever), and search for 'changing dns servers for xxxxx' where xxxx is the kind of device you have or the operating system it's running.

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As for changing the IPv4 servers, I have no idea how you did that or what you mean by 'it doesn't work' so I can't comment any further. ' they give me the OpenDNS block addresses so I use a DNS lookup website' This is not needed. You simply use another DNS service like Google Public DNS. Nslookup www.youtube.com. 8.8.4.4 ' after I get my addresses and add them to the hosts file it still dosent work' You may not have caught all needed domain names. Find them here: ' if I change the hosts on the hosts file it dosent effect the nslookup cmd' Yes, nslookup doesn't use the hosts file but the DNS service being configured or specified. If you want to see the end result including local resolver cache and hosts file, you better use ping.

Ping www.youtube.com. ' i used the following command, nslookup 8.8.4.4, and I received the OpenDNS block address' This is not possible unless something routes your DNS traffic to OpenDNS despite specifying Google DNS. ' when added to hosts it was still blocked' You may have to flush the browser cache and the local resolver cache from an elevated command prompt first: ipconfig /flushdns Or, as I said, you did not catch all needed hostnames, or this blocking is not caused by OpenDNS. If you want, you can copy & paste the complete plain text outputs of the following commands to here to give me additional ideas about what could be wrong: nslookup -type=txt debug.opendns.com.

Nslookup www.youtube.com. Ping www.youtube.com netsh interface ipv4 show config.

This is the output of one command only, maybe two. ' *** google-public-dns-a.google.com can't find debug.opendns.com.: Non-existent domain' What command was behind this output? It seems you queried debug.opendns.com via Google Public DNS which does not know about debug.opendns.com.

So yes, google-public-dns-a.google.com cannot find debug.opendns.com, that's just normal. No new insights here. Further, I see for interface 'Wi-Fi': Statically Configured DNS Servers: 127.0.0.1 What does this localhost address point to? What DNS service is behind it? I would have expected to either see your router's address 192.168.0.1 there, or the OpenDNS resolver addresses. If you post command outputs, you post them including the command and the complete output.

Else it is very hard to comment on anything.