使用远程数据库作为spring boot数据源

IBM DB2 数据库。我在我的 application.properties 文件:

spring.jpa.hibernate.ddl-auto=none
spring.datasource.url=jdbc:db2://<dbhost>:<dbport>/<db>
spring.datasource.username=<username>
spring.datasource.password=<password>

spring:
  datasource:
    url: jdbc:db2://dashdb-txn-sbox.services.eu-gb.bluemix.net:3000/BLUDB:sslConnection=true;
  username: <username>
  password: <password>
  driverClassName: com.ibm.db2.jcc.DB2Driver
 jpa:
   properties:
     hibernate:
       dialect: org.hibernate.dialect.DB2Dialect

不过,我还是有这个错误:

A communication error occurred during operations on the connection's underlying socket, socket input stream, or socket output stream. Error location: Reply.fill() - socketInputStream.read (-1). Message: Read timed out. ERRORCODE=-4499, SQLSTATE=08001