【待反馈】链接mysql Communications link failure

我写了一个SpringMVC的java项目，本地链接mysql正常，但是部署到服务器 报以下错误com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 1,002 milliseconds ago.  The last packet sent successfully to the server was 1,001 milliseconds ago.


mysql 配置
[client]
#password        = your_password
port                = 3306
socket                = /tmp/mysql.sock

[mysqld]
port                = 3306
socket                = /tmp/mysql.sock
datadir = /www/server/data
default_storage_engine = InnoDB
performance_schema_max_table_instances = 400
table_definition_cache = 400
skip-external-locking
key_buffer_size = 32M
max_allowed_packet = 100G
table_open_cache = 128
sort_buffer_size = 768K
net_buffer_length = 4K
read_buffer_size = 768K
read_rnd_buffer_size = 256K
myisam_sort_buffer_size = 8M
thread_cache_size = 16
query_cache_size = 16M
tmp_table_size = 32M
sql-mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
wait_timeout = 86400
interactive_timeout = 31536000

explicit_defaults_for_timestamp = true
#skip-name-resolve
max_connections = 500
max_connect_errors = 100
open_files_limit = 65535

log-bin=mysql-bin
binlog_format=mixed
server-id = 1
expire_logs_days = 10
slow_query_log=1
slow-query-log-file=/www/server/data/mysql-slow.log
long_query_time=3
#log_queries_not_using_indexes=on
early-plugin-load = ""


innodb_data_home_dir = /www/server/data
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = /www/server/data
innodb_buffer_pool_size = 128M
innodb_log_file_size = 64M
innodb_log_buffer_size = 16M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 86400
innodb_max_dirty_pages_pct = 90
innodb_read_io_threads = 1
innodb_write_io_threads = 1

[mysqldump]
quick
max_allowed_packet = 500M

[mysql]
no-auto-rehash

[myisamchk]
key_buffer_size = 32M
sort_buffer_size = 768K
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout


后台数据配置（敏感信息*代替）
spring.datasource.url=jdbc:mysql://*********:3306/blogs?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=***********spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.max-wait=8000000
spring.datasource.hikari.connection-timeout=8000000
spring.datasource.connection-timeout=8000000
spring.datasource.druid.testWhileIdle=true
spring.datasource.druid.testOnBorrow=true
spring.datasource.druid.testOnReturn=true

3306 ,服务器，及面板都已经开放，求大佬指教

链接地址使用的是公网IP还是内网127.0.0.1或者localhost呢？
如是链接使用的公网IP的话，那你服务器运营是存在安全组策略，如有安全组策略的话，需要添加。