New
#1
Strange hostname resolution failure
When I attempt to access a URL from my browser, it fails to load, however when I look up the IP for the domain name using my router's whois tool and type it into the address bar, I can access the website. Some software that accesses the internet sometimes works as well, such as Steam and nslookup, but not ping.
I have found a temporary fix: uninstalling my NIC drivers, rebooting, and allowing my drivers to reinstall seems to help, at least until I reboot again. The problem and the fix are reproducible.
Salient facts: Win7 pro SP1, Comodo firewall, Avira free antivirus linksys router that's a few years old, connecting via ethernet.
-------------Fix attempts:
Router Powercycle
Modem Powercycle
connect directly to modem
turn off firewall
try different browsers
try Google's free DNS
Checked in with ISP to make sure their DNS wasn't having problems
make sure proxies aren't running - tor isn't running, proxy settings are clear in browser
update NIC drivers
clear hosts file in /system32/drivers/etc
make sure UAC is activated
scan for virii/malware using avira, malwarebytes, superantispyware, hijackthis, ckscanner
at command prompt, run: netsh int ip reset **then** netsh winsock reset **then** ipconfig /flushdns
I also ran the networking .bat file from sevenforums, although its contents are similar to what I've already done
Fix registry errors via glary utilities
updated Java and cleared out older versions
updated Flash
-------------Other diagnostic symptoms when unable to resolve host names:
nslookup seems to work (this is strange; why would nslookup work, but hostname resolution fail elsewhere?)
pinging a hostname from console does not work
Comodo doesn't show unusual activity, as best as I can tell
networkminer doesn't show unusual activity, as best as I can tell
router can ping host names
Can't see other network computers on windows network
Steam connects, sometimes after asking for a retry
Avira fails to update when prompted
-------------Other diagnostics:
Web browsing works proplerly from an Ubuntu 10.10 live CD
One other computer (also Win7) on the same network had a similar problem a little while ago - I wasn't using it, but it apparently gave an error a couple of times along the lines of saying that network drivers weren't installed or weren't installed properly, but rebooting fixed the problem and there were no notifiers of drivers for new hardware beign reinstalled. This error hasn't happened recently, and I'm not sure how reproducible the problem is.
Other devices, such as laptops and smartphones, don't seem to have trouble connecting.
-------------IPconfig log:
Note: I scrubbed some names and numbers off of this; let me know if I got overzealous and nixed something important.
Code:Windows IP Configuration Host Name . . . . . . . . . . . . : [n/a] Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : [n/a] Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : [n/a] Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller Physical Address. . . . . . . . . : [n/a] DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::8d5:af0:1b2e:d294%21(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.1.102(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Tuesday, March 15, 2011 6:35:29 PM Lease Expires . . . . . . . . . . : Wednesday, March 16, 2011 6:35:29 PM Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DHCPv6 IAID . . . . . . . . . . . : [n/a] DHCPv6 Client DUID. . . . . . . . : [n/a] DNS Servers . . . . . . . . . . . : [n/a] [n/a] NetBIOS over Tcpip. . . . . . . . : Enabled Tunnel adapter isatap.[n/a].net: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : [n/a] Description . . . . . . . . . . . : Microsoft ISATAP Adapter Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Tunnel adapter Local Area Connection* 9: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv6 Address. . . . . . . . . . . : [n/a](Pref erred) Link-local IPv6 Address . . . . . : fe80::3cf8:2030:b3f1:a977%10(Preferred) Default Gateway . . . . . . . . . : :: NetBIOS over Tcpip. . . . . . . . : Disabled