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Strange IPS warnings since today

PSyc
Hello all,

since today the IPS has some strange detections and I receive periodically the notifications, until now approx. 130.

Unfortunately I can't figure out what the problem is.

---
Subject: [GQDN Gateway][WARN-850] Intrusion Prevention Alert

Intrusion Prevention Alert

Details about the intrusion alert:

Message........: ICMP Microsoft remote unauthenticated DoS/bugcheck vulnerability
Details........: Snort ::
Time...........: 2012:05:21-16:02:07
Packet dropped.: no
Priority.......: medium
Classification.: Attempted Denial of Service
IP protocol....: 1 (ICMP)

Source IP address: ***.***.***.1 (gateway)
Source port: 0
Destination IP address: ***.***.***.201 (FQDN Server)
Destination port: 0
---

System Version is 8.302.

I receive this notifacations for two server ***.***.***.200 and .201. Both servers are configured as DC and DNS.

Why the Astaro is initiating such requestes on Port 0?

Thoughts, comments, solutions are much appreciated.

Many thanks.

PSyc


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  • 0
    Hi, PSyc,

    1. Which Remote Access methods do you have active when this occurs? 
    2. Do you have a masquerading rule like 'VPN Pool (????) -> Internal' or a similar SNAT? 
    3. Can you confirm that the Host definitions for your two DCs have 'Interface: >' instead of being bound to an interface?
    4. Is "VPN Pool (????)" listed in 'Internal networks' in Intrusion Prevention?

    Cheers - Bob
  • 0 in reply to BAlfson
    Hi Bob,

    thanks for your fast reply.

    1. Only SSL VPN is active
    2. Yes, rules are set SSL VPN to INTERNAL
    3. Confirmed
    4. Yes

    The strange thing is, that we didn't had this issue in the past. We didn't changed the enviroment in the last days/weeks .. 

    Looks like I've a misconfiguration.

    Any ideas?

    Many thanks.

    Cheers
    Alex
Reply
  • 0 in reply to BAlfson
    Hi Bob,

    thanks for your fast reply.

    1. Only SSL VPN is active
    2. Yes, rules are set SSL VPN to INTERNAL
    3. Confirmed
    4. Yes

    The strange thing is, that we didn't had this issue in the past. We didn't changed the enviroment in the last days/weeks .. 

    Looks like I've a misconfiguration.

    Any ideas?

    Many thanks.

    Cheers
    Alex
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