NETWORK TROUBLESHOOTING ISSUES

Network Troubleshooting Issues & Possible Resolutions:

CONNECTIVITY ISSUES:

• Check to see if cable is plugged in
• Check link light
• Swap cables
• Check card - Device Manager if  card is working properly, if not reinstall drivers - still not working indicates bad card

INTERFERENCE ISSUES:

 

WIRELESS

• Same frequency
• Cordless phones
• Video distribution systems it uses all your wireless frequencies
• Physical structure degradation of signal

             

  WIRED 

• Not next to motors or fluorescent lights

Causing EMI

•  Cables kinked or worn
• Route through wall or ceilings
• If floors make sure cables are encased

PROTOCOL ISSUES:

• Protocol installed

• DHCP Settings
• Address  - must be unique
• Mask - right network
• Router - default gateway is correct
• DNS server - make sure it is correct
• USE IPCONFIG /ALL  to verify correct settings

COMMUNICATION ISSUES:

PING can tell you a lot about the status of your network.    Ping the :

• Loopback 127.0.0.1 to test your TCP/IP configurations on your local host.
• A destination , no response try to ping another host,
• If no response, check cables, NIC, or the IP configurations on you computer
• If connects to private but not internet, then, verify default gateway on your computer
• If all computers cannot connect to a remote computer, troubleshoot the router connection on the remote network.

• DNS, by IP address works, but ping to DNS name fails, then you probably have a DNS (name resolution)  problem.

If the remote system your trying to test is on a different network segment use:

• TRACERT to check the path of a ping
• Check each step of the path to see if something is blocking communications.

NETWORK ISSUES:

Network FIREWALLS  are pre-programmed to not let PING echo  packets through.
- Check firewalls on both end devices to see if communications are being blocked by a host-based firewall.
- Check the service on the target device to make sure that it is running and is properly configured.  For example:  if you can not access a shared folder, make sure the folder is shared.

RESOURCE ACCESS ISSUES:

Login issues

•  Verify Username & password

• Ensure caps & number locks are disabled

• Account Lockout  attempts

• Verify user's account is enabled
• Verify user has the needed permissions to access resouces