I have a new DB2 server (v10.5.0.3), and I can connect to the database locally just fine.
When trying to connect from a remote server using JDBC I am getting the "Connection refused. ERRORCODE=-4499, SQLSTATE=08001" error. Based on information found here https://www-304.ibm.com/support/docview.wss?uid=swg21403644 I have confirmed that
[db2inst1@db2 ~]$ db2set -all
[i] DB2COMM=TCPIP
[i] DB2AUTOSTART=YES
[g] DB2SYSTEM=db2.xxxx.com
[g] DB2INSTDEF=db2inst1
[g] DB2ADMINSERVER=xxxxxx
and
[db2inst1@db2 ~]$ db2 get database manager configuration | grep -i svce
TCP/IP Service name (SVCENAME) = 50001
SSL service name (SSL_SVCENAME) =
with these JDBC connection values
driver=com.ibm.db2.jcc.DB2Driver
url=jdbc:db2://db2.xxxxx.com:50001/TESTGEN
username=XXXXXXXX
password=XXXXXXX
I have verified that the firewall on the both servers have opened ports 50000 and 50001. I've run out of ideas, any help is greatly appreciated.
It was indeed a network error. I'm not fully sure which fix was the most important but I made sure telnet was enabled and white listed the DB2 process in the RHEL firewall configuration.
I had the same trouble... Its was caused by IPV6... The URL connection point to localhost, resolved as ::1 (the IPV6 address of localhost) and DB2 server doens't listing IPV6 protocol.
I resolved by modify the c:\windows\system32\driver\etc\host file : I uncomment the line 127.0.0.1 locahost to force ipv4 resolution name of locahost... and it's works.
I hope that helps. (sorry for my English)
来源：https://stackoverflow.com/questions/32289409/db2-jdbc-connection-error-connection-refused-errorcode-4499-sqlstate-08001