port 500 SYTEK UDP

I presume you mean "Outpost". This is no firewall, neither does it create any useful information. Why do you even log such stuff?

In case of doubt: no. Why are you even asking? If this answer isn't already clear to you, you should not try to run any firewall.

And what's the meaning of "SYTEK" in that context?

Yes, Outpost 4.0

OK thx

Why are you even asking? If this answer isn't

I was looking for description UDP:500 and I read in this way: 500 SYTEK UDP Unfortunately, I don't know what the "SYTEK" means

Who tells such a nonsense? UDP 500 typically is ISAKMP, which is exactly what /etc/services tells. I'm not able to find anything there about "SYTEK".

And as someone who wants to run a firewall you should definitely know that.

OK, OK, maybe someone learnts... Should I open this port? Thank You

As Sebastian said in his first reply to you: When in doubt - NO!

Why would you want to do that?

cu

Ansgar -59cobalt- Wiechers wrote: : adax wrote: : > Hello, I have firewall alert (opost 4.0), remote address: : > 219.74.174.53 (Singapore) want my local UDP:500. : > Advice please, should I open this port? Thx

: Why would you want to do that?

If you're having VPN users that can connect to your network while travelling you might need to open this port in order to get IKE working.

Lars