Debug Log messages

Hello all, We recently discovered in our debug log, the following messages:

2018-09-17 13:29:13.173 INET.11528.0 ["/inet/inet_util.c $Rev: 62619 $ $Date:: 2018-05-10 10:00:31 ":2589] A.10.03 b182
[RxGetThumbprint] Encryption status unknown for host 111.197.142.221

2018-09-17 14:47:59.754 INET.12805.0 ["/inet/inet_util.c $Rev: 62619 $ $Date:: 2018-05-10 10:00:31 ":2589] A.10.03 b182
[RxGetThumbprint] Encryption status unknown for host 50.red-5-205-113.dynamicip.rima-tde.net

They are occuring randomly and from different IP's and domains. anyone have ideas? We have searched our firewall and IDS logs and do not see these addresses at all. The server is internal and has a 10.n.n.n address and not accessable from internet

I forgot to add This is an HPUX 11.31 server running DP1.04.

Thanks,

Tommy