MDNSResponder taking 100 percent CPU after upgrading to 10.5.1

Hello,
just want to know if anybody else has the same problem.
After upgrading to 10.5.1 the process mDNSResponder took up almost 100 percent of CPU power.
In the system.log following line appears (very often):
mDNSResponder[171]: KQ SSLHandshake failed: -9806
I took a look at my Linux firewall in front of my network and it drops a lot of packages:
REJECT:IN=eth0 OUT=ppp0 SRC=192.168.2.20 DST=17.250.248.161 LEN=64 TOS=0x00 PREC=0x00 TTL=63 ID=47178 DF PROTO=TCP SPT=63684 DPT=5354 WINDOW=65535 RES=0x00 SYN URGP=0
Looking who is 17.250.248.161 turn out:
bash-3.2# dig -x 17.250.248.161
; <<>> DiG 9.4.1-P1 <<>> -x 17.250.248.161
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7068
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;161.248.250.17.in-addr.arpa. IN PTR
;; ANSWER SECTION:
161.248.250.17.in-addr.arpa. 6000 IN PTR pm-members.mac.com.
;; Query time: 210 msec
;; SERVER: 192.168.2.1#53(192.168.2.1)
;; WHEN: Fri Nov 16 06:45:11 2007
;; MSG SIZE rcvd: 77
Maybe this is a server something to do with .MAC (I'm a member and some sync are turned on)?
I opened the 5354 port and mDNSReponder is now running normal.
But hey Apple, I don't want computers be registered by Bonjour or something else at your servers.
Can you please check this out?
Thanks for your answers.
Andreas

Hi
I think I found the cause to my problem and also solved it?
When I investigated my "Console Log" the next message was repeated :
... mDNSResponder[202] Failed to obtain NAT port mapping from router 10.0.1.1 external address xxx.xxx.xxx.xxx internal port 9999
This gave me an idea and pointed in the NAT configurations.
What have I done (which solved my problem) :
• opened "Airport Utility"
• selected my Airport Base Station
• choose "manual Setup"
• choose "internet connection"
• after that i selected the tab "NAT"
• where I deactivated "Enable NAT port mapping protocol"
• and then I updated my Airport Base station
=> since then, no more the problem and de message disappeared from the "Console Log"
Greetings
Peter

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