If the error (code: 0003-0002) appears after the pre-upgrade check, it indicates that the device encountered critical process errors. Please contact the service provider or Sangfor technical support to perform the following operations to fix the error:

1. Run the systemctl status afsys-datacenter-TinyTableProxy.service command in the device backend to check whether the afsys-datacenter-TinyTableProxy.service process is active. If the process is not active, it is abnormal.

2. If the process is not active, run the systemctl start afsys-datacenter-TinyTableProxy.service command to start it.

3. Run the check_service.sh command to check if any critical processes are abnormal.

4. If some critical processes are abnormal, perform the following operations:

If the dataplane process is abnormal, run the /sfos/system/dp/bin/app_manage_ctl -restarts flowd command to restart it.

If the cfg-center process is abnormal, run the /sfos/system/dp/bin/app_manage_ctl -restarts cfg-center command to restart it.

If other critical processes are abnormal, run the following commands to restore them (taking the sshd process as an example):

1. Run the systemctl | grep sshd command to check whether the sshd process service exists.

2. If the sshd process service exists, run the systemctl restart sshd.service command to restart the service.

3. Run the systemctl status sshd.service command to check whether the service status is active.

4. If the sshd process service does not exist, run the following commands:

systemctl start afsys-basic-tsklogd.service

systemctl start afsys-basic-imdtskd.service

systemctl start afsys-system-logs.service

systemctl start sfos_app

5. If the error persists, contact Sangfor technical support.