Unauthorized Port Scan, Juniper SSG

I am getting an alarm email from our firewall. It is from 125.68.57.xxx. I'm not familiar with this IP and dont know how to find out who it is.

My question is:
1. Should I be worried?
2. What is a port scan and how can it effect me?
3. WHat should I do?
4. Can I find out what it did to my network?

Thank You
SW111Asked:
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rsivanandanCommented:
You can easily find out which place this ip is originated from (www.maxmind.com).

For example, http://www.maxmind.com/app/locate_ip?ips=125.68.57.1, this link would give you where the ip 125.68.57.1 is coming from and other info like that.

1. Yes you should be worried.

2. Port Scan essentially finds out what all services you host inside your network (in other words how a connection can be made to your internal network through the firewall).

3. Put a policy in SSG blocking all the traffic coming from this IP.

4. If you have traffic logs enabled on the firewall, you can browse through and see what all happened wrt. this ip address.

Cheers,
Rajesh
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SW111Author Commented:
Ok. Thanks. perhaps another info I should have included is that it is scanning this port:
125.68.57.213:6000 to our port xxx.xx.xx.xxx:8090 proto TCP
I dont think we even use this port, although there are a bunch of policies using TCH0-65535 as source. Is this the problem?

Also, I can find only 1 login SSG that describes this event. So there isnt much new info there.
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rsivanandanCommented:
See this;

https://isc.sans.org/port.html?port=8090

Cheers,
Rajesh
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