Intermittent socket issues on OVM running OEL 5.5

Question

Hi All -
We wrote a load balancer in C which essentially routes the new user connections to a set of servers (which are Java programs listening at a prespecified port #). Load balancer uses standard socket communication for dispatching the user connections to the server. When a new user connection comes to the load balancer, it picks a least loaded server and tries to make a socket connection to the server and transfers the data back and forth between the client and the server. If the load balancer is unable to make a socket connection to the server (after picking the least loaded server), it marks the server as dead and won't forward any new user connections to that specific server. If this socket connection failure happens for all available servers then it marks all servers as dropped and won't forward any new user connection to any servers since it thinks there are no servers available.
Below is the code that tries to make the socket connection to the server (from load balancer) -
(connect( serverSocket, (struct sockaddr *)&(serverAddr), sizeof(serverAddr),NULL,NULL,NULL) == SOCKET_ERROR)
This is returning an errno - 111 - connection refused.
Please note that we are still able to connect to the server directly. The above error happens intermittently. Pls let us know of any reasons why the above code fails to connect to the server intermittently. Please note that this is specific to OVM running OEL 5.5.
thanks

Answer 1

Hi,
Could you provide some detailed configuration data please?
On the guest and the Dom0, to get the network config + the exact kernel versions:
# uname -a
# cat /etc/modprobe.conf
Thanks,
John Sobecki