有关于DB2数据库连接的问题！

在单点登录的时候报这个错误，请各位大神们，提供解决思路！


org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.jdbc.UncategorizedSQLException:
### Error querying database.  Cause: com.ibm.db2.jcc.b.DisconnectException: A communication error has been detected. Communication protocol being used: T4Agent.sendRequest(). Communication API being used: OutputStream.flush(). Location where the error was detected: Connection timed out. Communication function detecting the error: *. Protocol specific error codes(s) TCP/IP SOCKETS
### The error may exist in mapper/UserMapper.xml
### The error may involve com.springmvc.beans.User.getByWhere-Inline
### The error occurred while setting parameters
### SQL: select * from USER_UNIT_MAP where USERID='lingyuwang'
### Cause: com.ibm.db2.jcc.b.DisconnectException: A communication error has been detected. Communication protocol being used: T4Agent.sendRequest(). Communication API being used: OutputStream.flush(). Location where the error was detected: Connection timed out. Communication function detecting the error: *. Protocol specific error codes(s) TCP/IP SOCKETS
; uncategorized SQLException for SQL []; SQL state [null]; error code [-4499]; A communication error has been detected. Communication protocol being used: T4Agent.sendRequest(). Communication API being used: OutputStream.flush(). Location where the error was detected: Connection timed out. Communication function detecting the error: *. Protocol specific error codes(s) TCP/IP SOCKETS ; nested exception is com.ibm.db2.jcc.b.DisconnectException: A communication error has been detected. Communication protocol being used: T4Agent.sendRequest(). Communication API being used: OutputStream.flush(). Location where the error was detected: Connection timed out. Communication function detecting the error: *. Protocol specific error codes(s) TCP/IP SOCKETS
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
com.springmvc.security.LoginFilter.doFilter(LoginFilter.java:36)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)