Member Avatar for manitm16

I have a desktop win xp3 and laptop win7 home basic with router.I can access internet from both, but only one at a time. If I try connect the second computer to internet I get the notification "Error 105 (net::ERR_NAME_NOT_RESOLVED): Unable to resolve the server’s DNS address" Request anyone to suggest a solution.

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Brief diagnostic summary and practical steps. The behavior described by (each PC works alone but the second gets a name-resolution failure when both are connected) most often points to one of: a DHCP / static-IP conflict, the router/modem only allowing a single client, or a DNS resolver problem. As asked, confirm whether adapters are set to DHCP or static. As suggested, ensure the two machines do not share the same hostname. 's public-DNS idea is a good DNS test but only after confirming whether the fault is DNS vs networking.

Suggested checks to run on each Windows PC (run from an elevated prompt):

ipconfig /all
ping 8.8.8.8 -n 4
nslookup google.com
ipconfig /flushdns
ipconfig /release
ipconfig /renew
netsh winsock reset
netsh int ip reset

What to look for: unique IPv4 addresses (not the same address on both machines), gateway present, and a valid DNS server listed. If ping 8.8.8.8 works but nslookup fails, the problem is DNS only — try temporarily pointing the client or router DNS to 8.8.8.8 and 1.1.1.1. If ping to 8.8.8.8 fails or a 169.254.x.x address appears, DHCP or an IP conflict is the issue — switch any static IPs to DHCP or give each static IP a unique address in the router's LAN range.

Router/modem checks and fixes: log into the router and verify the DHCP pool size and current lease count, disable MAC filtering, and turn off wireless client isolation. Confirm the device is in NAT/gateway mode (not bridge) so internal clients share the single WAN IP. If the ISP ties service to one MAC, ensure the router handles the WAN session (or use WAN MAC clone) so multiple LAN clients can access the internet. Restart modem/router, back up the router config before changes, and update firmware if available. Testing both PCs on a different network (for example a phone hotspot) will quickly show whether the router/ISP is the root cause.

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Member Avatar for Rik_

Is everything set to DHCP or static IP?

Member Avatar for rubberman

I was going to ask Rik's question, but need to also ask if you might be using the same host name for both systems?

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