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How to troubleshoot firewall and router problems


Misconfigured network routers, personal firewalls and network appliances can cause issues and errors with PLATO lessons. Reviewing configurations and making necesary changes can alleviate these errors.


For a complete list of supported and tested network and workstation configurations please see the link below to review all network and workstation configuration requirements:

System Requirements - All Products

Open Ports

Currently, the following ports must be open for PLE:

  • Port 80 - Standard HTTP port of Web page access
  • Port 443 - Open for HTTPS for an SSL connection (Secure Sockets Layer) 

See the user documentation for your firewall for step-by-step instructions on how to configure the firewall so that the ports are open.  The user documentation may be help files, documentation that shipped with your firewall, or online user documentation on your firewall vendor's web site.

If your firewall vendor's user documentation does not provide instructions for opening ports in the firewall, contact your firewall vendor for support.

MP3 Audio files

Do NOT block MP3 audio files coming from * If these MP3 audio files are blocked, this will prevent certain lessons from loading (Foundational Math).

BlackICE - Note:  IBM Internet Security Systems discontinued support as of 9/29/2008.

Cisco PIX

Disable Denial of Service Attack checking for any PLATO content sites.

Find user documentation for Norton/Symantec products
Search Symantec's site or knowledge base for help with Norton Internet Security or other products
What to do if you cannot access a specific web site after installing Norton Internet Security or Norton Personal Firewall

Packet Shaping (Packeteer)

Do not prioritize any PLATO traffic; just allow traffic from * to pass through without any checking or prioritizing.


Download SonicWALL documentation
Search SonicWALL's knowledge base for help or contact SonicWall Support


Do NOT scan any traffic from *

Articles about firewalls

Description of a Personal Firewall
Description of the Windows XP Internet Connection Firewall
Microsoft FAQs about Internet firewalls
How to enable or disable Internet Connection Firewall in Windows XP


How to get more help

Copyright Information

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