Error while starting app server in 25.1

Getting below error while starting tomcat

{"error":{"root_cause":[{"type":"security_exception","reason":"unable to authenticate user [appian] for REST request [/user-activity-8-0/_settings?master_timeout=30s&timeout=30s]","header":{"WWW-Authenticate":["Basic realm=\"security\", charset=\"UTF-8\"","ApiKey"]}}],"type":"security_exception","reason":"unable to authenticate user [appian] for REST request [/user-activity-8-0/_settings?master_timeout=30s&timeout=30s]","header":{"WWW-Authenticate":["Basic realm=\"security\", charset=\"UTF-8\"","ApiKey"]}},"status":401}