Tips for debugging the SPX and SPXII problems. 

1. Get the End to End packet trace using LANalyser or SNIFFER or any other packet tracing tool. 
Analyze to find out the reason for failure. 

2. Check the number of LSL Packet Receive Buffers or ECBs that are available to the system by 
loading monitor.nlm. Strange things can happen when the server runs out of packet receive buffers.
All server activities could come to a grinding halt. 

3. In the case of server ABENDs get the image dump. 

4. Check the version of SPXS.NLM (if SPXS is used). 

5. If the throughput of SPX/SPXS is bad on a link check the quality of the link.
PING.NLM could be used (This is the PING that works with IP). 
Try sending packets larger than 1000 bytes. PING.NLM would report the percentage loss on the 
link. 

6. Check the CPU utilization if throughput is bad and try finding the process that hogs the CPU. 


7. Try to reproduce the problem with limited SPX sessions. The debugging complexity increases 
with the number of SPX connections made.