I need some help on troubleshooting an issue with the Mercury LoadRunner. We are running a LoadTest with Mercury LoadRunner 7.8 against an RAC-enabled Oracle 11i (11.5.9) suite. This is a three-tier architecture with three RAC nodes on the backend running Oracle instances, administration and concurrent processing servers and one v880 server on the middle-tier running forms and Apache servers. Some of the LoadRunner connections have been dropping with "Error in reading from Socket or Server not responding". The middle tier has 6 CPU and 12GB RAM and we are driving approximately 120 forms sessions. When the first time this message appeared, I looked at "sar -u" and "sar -q" statistics and discovered that the CPU idle was almost zero and the run-queue length was b/w 12-14 with queue 100% full. This condition had sustained for about 6-8 minutes and thereafter the CPU got released. The wait time defined within the LoadRunnder is 2 minutes and I have been told by our testing folks that if a LoadRunner virtual user connection is not established during this period then the above message is encountered. However, there a few drops in the later part of the afternoon where neither the CPU was pegged nor the run-queue was full. If anyone has seen this issue then could you please shared with me the reason under what circumstances the LoadRunner terminates a connection with "Error in reading from Socket or Server not responding" message. Any help will be appreciated. Thanks Amir