Software Problems:  Software problems at the workstation                        
can prevent you from communicating on the network.                              
These problems can arise for many reasons and are sometimes                     
difficult to resolve.  However, the two most common                             
causes for workstation software problems are incorrectly                        
configured media access control (MAC) drivers and incorrectly                   
configured protocol stacks.  Begin by examining these two                       
critical areas, and then contact your network administrator                     
if you need more help.                                                          
                                                                                
LAN Problems:  Problems on the LAN itself can also prevent                      
you from communicating with it, and these problems also can                     
arise for many reasons.  For example, devices on the LAN with                   
which you are trying to communicate, such as servers,                           
routers, bridges, and gateways, may not be active or may not                    
recognize your address and allow you access.  Again, most LAN                   
problems are best resolved with the help of your network                        
administrator.                                                                  
 
Configuration Problems:  If you have configured your
adapter for manual speed selection, check that you have
selected the correct speed.  If you have configured for
automatic ring speed detection, check that your hub or
concentrator is NOT configured to prevent adapters at
the incorrect speed from inserting.  Some hubs designed
to exclude adapters set to the incorrect speed are
incompatible with automatic speed detection in the
adapter.