Check whether the usage ratio of the CPU, memory, and disk is high for a long time according to the system status on the device console. If so, follow the steps below:

Note: After login into the device, the first page displayed shows the system status.

1. Choose Home > Network Operations > Throughput and check whether the current bandwidth is in full load all the time.
2. Choose Home > Network Operations > Concurrent Session/New Session and check whether the emergency concurrent sessions or new sessions are generated.
3. Enable the anti-DoS attack module for the device and check whether the device is suffered from DoS attacks. Choose Monitoring > Logs > Security Logs to view the anti-DoS attack logs.
4. Check whether any process runs abnormally. (Contact the technical support engineer from Sangfor for confirmation.)