Difficulty communicating with my financial institution's website

Test the UBS sign-in from the Windows 11 PC through a phone hotspot and from another device on the normal home network; these two tests will identify whether the problem follows the PC, the network connection, or the UBS service.

1. Isolate where the failure occurs

Use a private/incognito browser window for each test, and manually navigate from UBS’s official U.S. login hub rather than using an old bookmark ^1^.

Microsoft similarly recommends comparing another device and an alternate connection to narrow down whether a connectivity problem belongs to the original PC or network ^2^.

2. If the problem follows the Windows PC

Since using multiple browsers has not resolved it, concentrate on shared Windows networking rather than reinstalling a browser.

1. Open Settings → System → Troubleshoot → Other troubleshooters.
2. Find Network and Internet, select Run, and then run the network tests in Get Help ^3^.
3. Check Settings → Network & internet → Proxy.
   • If this is a personal PC and no organization requires a proxy, verify that Use a proxy server and any unknown setup script are off.
   • Leave required workplace proxy settings unchanged; proxy traffic is routed through an intermediary and may be organization-managed ^4^.
4. Open Command Prompt as administrator and reset the network stack:

netsh winsock reset
netsh int ip reset
ipconfig /release
ipconfig /renew
ipconfig /flushdns

Restart the PC afterward and test UBS again. These commands reset Winsock/TCP-IP, renew the address, and clear the DNS resolver cache ^2^.

3. If the problem is limited to the home network

1. Power off the modem and router.
2. Wait at least 30 seconds.
3. Start the modem and wait for it to finish connecting.
4. Start the router, wait several minutes, and retest.

If the hotspot remains reliable but the home connection does not, report that comparison to the ISP. It gives them a specific network-path symptom to investigate. Microsoft documents the modem/router restart and alternate-connection test as network-isolation steps ^2^.

Conditional fallbacks

• If the failure follows the PC after the network commands: perform a clean boot and test UBS. If the site works there, re-enable non-Microsoft services and startup items in halves until the interfering VPN, filtering, security, or other background software is identified. A clean boot starts Windows with essential drivers and startup programs specifically to isolate such conflicts ^5^.
• Use Network reset only last: go to Settings → Network & internet → Advanced network settings → Network reset → Reset now. This removes and reinstalls network adapters and restores their settings to defaults. VPN clients and virtual switches might require reconfiguration afterward ^2^.
• If every test points to UBS: contact UBS and provide the approximate timestamps, whether login completed, the browsers tested, and whether the same failure occurred over both home internet and a mobile hotspot. Do not post account details, screenshots containing balances, or authentication codes publicly.

References

1. United States - UBS
2. Windows 11
3. Windows 11
4. Use a proxy server in Windows | Microsoft Support
5. Windows 11