Splunk no longer listens on SSL-enable port 9997 after upgrade to Splunk 5

[dshakespeare_sp]

Since upgrading from Splunk 4.3 to Splunk 5.0 customer reports that they ate unable to index data because the SSL-enabled input port doesn't work. The following errors are seen in splunkd.log

INFO SSLCommon - SSL compression not turned on
INFO TcpInputConfig - IPv6 port 9997 is reserved for splunk 2 splunk (SSL)
INFO TcpInputConfig - IPv6 port 9997 is compressed
ERROR TcpInputConfig - SSL context not found. Will not open splunk 2 splunk (SSL) IPv4 port 9997

[dshakespeare_sp]

The problem occurs if "listenOnIPv6 = yes" is set in server.conf.
A workaround is to set "listenOnIPv6 = no" in server.conf

Splunk are aware of this issue. see
http://docs.splunk.com/Documentation/Splunk/5.0/ReleaseNotes/KnownIssues#Data_input_issues