Because you have a port added to the SPLUNK_BINDIP
http://docs.splunk.com/Documentation/Splunk/6.5.1/Admin/BindSplunktoanIP
If you want this to be a permanent change in your working environment, modify $SPLUNK_HOME/etc/splunk-launch.conf to include the SPLUNK_BINDIP attribute and value. For example, to bind Splunk ports to 127.0.0.1 (for local loopback only), splunk-launch.conf should read:
Modify the following line to suit the location of your Splunk install.
If unset, Splunk will use the parent of the directory this configuration
file was found in
SPLUNK_HOME=/opt/splunk
SPLUNK_BINDIP=127.0.0.1
Important: The mgmtHostPort attribute in web.conf has a default value of 127.0.0.1:8089. Therefore, if you change SPLUNK_BINDIP to any value besides 127.0.0.1, you must also change mgmtHostPort to use the same IP address. For example, if you make this change in splunk-launch.conf:
SPLUNK_BINDIP=10.10.10.1
you must also make this change in web.conf (assuming the management port is 8089):
mgmtHostPort=10.10.10.1:8089
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