1. Common Network Problems
- No internet connection (wired
or wireless)
- Wi-Fi connected but no internet
access
- Slow network speed or frequent
disconnections
- “Unidentified Network” or IP
configuration errors
- DNS or gateway unreachable
- Printer or shared folder not
accessible
2. Check the Basics First
Before
diving into technical fixes:
1.
Restart
your router/modem and PC.
Power-cycle them for at least 30 seconds.
2.
Check
cables and connections. Ensure
Ethernet cables are firmly plugged in.
3.
Verify
other devices. If multiple devices are offline,
the issue may be your ISP or router.
4.
Run a
speed test (e.g., speedtest.net)
to confirm network performance.
3. Fixing Wi-Fi Connection Issues (Windows)
Step 1: Run the Network Troubleshooter
Go to Settings → System →
Troubleshoot → Other troubleshooters → Network Adapter → Run.
Windows will automatically detect and fix common issues.
Step 2: Reset Network Settings
If
the issue persists:
netsh
winsock reset
netsh
int ip reset
ipconfig
/release
ipconfig
/renew
ipconfig
/flushdns
Then
restart your computer.
Step 3: Reinstall or Update Network Drivers
1.
Open Device Manager → Network
adapters.
2.
Right-click your Wi-Fi or Ethernet
device → Update driver.
3.
Or uninstall the device and restart
— Windows will reinstall it automatically.
Step 4: Check IP Configuration
To
verify correct network settings:
ipconfig
/all
Look
for:
- IPv4 address (should not be 169.x.x.x — that means no
DHCP connection)
- Default Gateway (should be your router’s IP, e.g.,
192.168.1.1)
If incorrect, manually assign IP in Network & Internet Settings → Adapter Options → Properties → IPv4 Settings.
4. Fixing Ethernet Connection Problems
Symptoms:
- “Network cable unplugged”
- “Unidentified network”
- No internet access even though
the cable is connected
Fixes:
1.
Try a different Ethernet cable or
port.
2.
Ensure the network adapter is
enabled:
3. Control
Panel → Network and Internet → Network Connections
4.
Disable and re-enable the adapter.
5.
Update or reinstall the LAN
driver from your PC manufacturer’s website.
6.
Reset router to factory settings if
multiple wired connections fail.
5. Fixing DNS and Internet Name Resolution Errors
Symptoms:
- Websites not loading despite
active connection
- “DNS Server not responding”
error
Fixes:
Option
1: Change DNS Server
1.
Go to Control Panel → Network and
Internet → Network Connections.
2.
Right-click active connection → Properties
→ Internet Protocol Version 4 (TCP/IPv4).
3.
Set preferred DNS to:
4. 8.8.8.8
5. 8.8.4.4
(Google
DNS) or use 1.1.1.1 (Cloudflare).
Option
2: Flush DNS Cache
ipconfig
/flushdns
Option
3: Reset TCP/IP Stack
netsh
int ip reset
6. Fixing “No Internet” After Windows Updates
Sometimes,
driver conflicts or update bugs can disconnect your network.
Fix:
1.
Roll back the network adapter
driver:
2. Device
Manager → Network adapters → Properties → Driver → Roll Back Driver
3.
If that fails, use:
4. Settings
→ Network & Internet → Advanced Network Settings → Network reset
5.
Restart your PC to rebuild the
network configuration.
7. Troubleshooting on macOS
Check Network Preferences
1.
Apple Menu
→ System Settings → Network.
2.
Make sure the correct adapter (Wi-Fi
or Ethernet) is active.
3.
Click Advanced → TCP/IP →
Renew DHCP Lease.
Reset Network Stack
In
Terminal:
sudo
ifconfig en0 down
sudo
ifconfig en0 up
Reset DNS Cache
sudo
dscacheutil -flushcache; sudo killall -HUP mDNSResponder
8. Linux Network Troubleshooting
Check Network Interfaces
ip
a
Restart Network Services
For
Ubuntu/Debian:
sudo
systemctl restart NetworkManager
Renew IP Address
sudo
dhclient -r
sudo
dhclient
Flush DNS Cache
sudo
systemd-resolve --flush-caches
Ping Test
ping
-c 4 google.com
If
DNS fails but IP ping works, you likely have a DNS issue.
9. Router and Modem Diagnostics
If
all devices are affected:
1.
Log in to your router (usually at 192.168.0.1 or 192.168.1.1).
2.
Check status, WAN IP,
and connected devices.
3.
Update router firmware if
available.
4.
If the ISP connection is down,
contact your provider’s support.
Tip: Use the router’s diagnostic or ping tool (often
found in the admin interface) to test connectivity.
10. Advanced Network Commands for Professionals
|
Command |
Description |
|
ping <IP or domain> |
Tests basic connectivity |
|
tracert <domain> |
Shows path packets take |
|
netstat -an |
Displays open network connections |
|
nslookup <domain> |
Checks DNS resolution |
|
pathping <domain> |
Tests route and packet loss |
|
route print |
Displays routing table |
11. Preventing Future Network Problems
- Keep your router firmware
and network drivers updated.
- Avoid using public Wi-Fi
without a VPN.
- Set a strong password
and use WPA3 encryption for Wi-Fi.
- Regularly restart your router
to clear cache and stale connections.
- Run periodic malware scans,
as malicious software can block or redirect traffic.
Conclusion
Networking
issues can be frustrating, but most are fixable with systematic troubleshooting.
By resetting network configurations, updating drivers, and testing both
hardware and software components, you can quickly restore full connectivity.
Remember: start simple—check cables, restart devices, and work your way up to
advanced fixes only when necessary.
Written by: UltraTechGuide
For more computer troubleshooting guides, visit: ultratechguide.blogspot.com
Post a Comment