Strange error on SM event log

Does anybody know the meaning of this error?

System Startup 
Software Version : CANOPY 9.0 SM-DES
Software Boot Version : CANOPYBOOT 1.0
FPGA Version : 061808
FPGA Features : DES, Sched
11:43:54 UT : Thu Nov 06 2008 : Time set
11:54:32 UT : Thu Nov 06 2008 : Delete Public Entry Protocol 17 Failed
11:54:32 UT : Thu Nov 06 2008 : Delete Private Entry Protocol 17 Failed
11:59:32 UT : Thu Nov 06 2008 : Delete Public Entry Protocol 17 Failed
11:59:32 UT : Thu Nov 06 2008 : Delete Private Entry Protocol 17 Failed
12:03:32 UT : Thu Nov 06 2008 : Delete Public Entry Protocol 17 Failed
12:03:32 UT : Thu Nov 06 2008 : Delete Private Entry Protocol 17 Failed
12:09:32 UT : Thu Nov 06 2008 : Delete Public Entry Protocol 17 Failed
12:09:32 UT : Thu Nov 06 2008 : Delete Private Entry Protocol 17 Failed


Please note that the same was happening on 8.2.7 release.

Are you running NAT on your SMs? IP Protocol 17 is UDP, perhaps it doesn’t like something your customer is doing?

salad wrote:
Are you running NAT on your SMs?


Yes, I am. But never seen that on the other SMs.
The only difference is that customer is using an IPSEC Vpn client...