When a Simpana Backup Client Failed to Perform the Backup

When a Simpana backup client failed to perform the backup task, the status reported the following error "failed to connect to indexing process from client [client] to [MediaAgent * MediaAgent * 8400 * 8402] .Error [Inability to connect to remote machine[MediaAgent] .Please check Network Connectivity or the machine may be down]." You check the client and the media service devices are normal. The possible reasons for this problem are:

A) The client JobResults directory is full
B) The media server IndexCache directory is full
C) The media server can not resolve the client host name
D) The client can not resolve the media server host name