As we have checked mysql/error.log found below error.
4247 [Warning] Aborted connection 4247 to db: 'unconnected' user: 'unauthenticated' host: 'PKBL-DPCS-S135.insetgroup.com' (This connection closed normally without authentication)
As I checked from server end mysql service is up and running without any error.
Would you suggest how can we resolve it.