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I have a Sierra 595U USB modem connected to my laptop. Internet access is working fine. I set up an ADHOC Wifi link from another laptop. I now want the other laptop(client) to access Internet thru the USB modem that is connected to the host laptop.

I set up ICS and got FTP to work fine but IE7 just gives the common "website not found/cannot connect" message.

I tried the microsoft forum. They are out of steam. I tried Telecom network experts, no go, so I hope you guys can kick some ass. To see what microsoft said you are welcome to visit

This way we won't need to reinvent the wheel.

What some guy said to me is that the modem needs to be NAT enabled. I don't know if it is. He recons that it may work if I use a USB Network Hub. It will be my next option unless I can get some more answers here. I look forward to try any ideas.
Ps. Keep in mind that this is a wireless mobile broadband (3G) modem. Apparently it must have the ability to handle 2 IP's for each laptop to be able to talk to it simultaneously. I don't know if it can. Still waiting for answers from Telecom on that.

Anyone out there looking for a challenge?
Kind regards,
Wintie.

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Brief expert summary and practical checklist based on this thread: ultimately fixed the problem by changing the host firewall settings. When a client on an ad‑hoc Wi‑Fi link can reach the host but not browse the web, the usual culprits are sharing/misrouting on the host, DNS being blocked, or a third‑party firewall preventing forwarded traffic. was also right to flag the dead Microsoft link — vendor documentation can move, so rely on diagnostic steps below rather than a single KB URL.

Quick troubleshooting checklist (run these on the host and the client):

  • Confirm Internet Connection Sharing is enabled on the host adapter that uses the USB modem, and that the wireless adapter is the shared/private LAN.
  • On the client, check IP, gateway and DNS (use ipconfig /all). The gateway should be the host LAN IP (Windows usually uses 192.168.0.1 for ICS).
  • Isolate DNS vs routing: try pinging an external IP from the client (for example, ping a public DNS). If IP pings work but hostnames do not, the issue is DNS. If IP pings fail, routing/NAT or firewall is blocking traffic.
  • Temporarily disable the host firewall. If the client suddenly gets full internet, the firewall was the blocker.

Notes on firewalls and mobile broadband modems:

  • Many third‑party security suites block forwarded/NATed traffic even when ICS is active. If disabling the firewall fixes it, recreate rules to permit ICS/shared networking, allow outbound TCP 80/443 and UDP/TCP 53, and mark the ad‑hoc network as trusted/private. Look for rules tied to the Windows SharedAccess/ICS service.
  • Windows ICS provides NAT and DHCP on the host, so most USB 3G modems do not have to supply multiple IPs. However, some modem manager software can interfere with ICS; if problems persist consider using a small 3G USB router or a dedicated travel router that supports USB modems.

Collect ipconfig /all and basic ping/traceroute results if the issue recurs — those make targeted troubleshooting much faster.

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Member Avatar for caperjack

I tried the microsoft forum. They are out of steam. I tried Telecom network experts, no go, so I hope you guys can kick some ass. To see what microsoft said you are welcome to visit

link not working.

Member Avatar for Wintie

All the drama due to my PCCillin firewall settings. Thanks to CableForum it is all sorted. Thanks for your response anyway.
It is much appreciated.
Regards,
Wintie

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