Blocked attacks
Blocked attacks
You can view the history of DDoS attacks blocked by Servercore protection in the control panel.
Servercore protection works at the network and transport layer (L3-L4). If your monitoring systems have detected an application-level attack (L7) or other malicious activity — contact helpdesk.
View attack history
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In Control Panel, go to Network Services → Network Incidents.
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Open the Blocked Attacks tab. For each attack, the network attacked, the period of the attack, and the response from the defense system are specified:
block— suspicious traffic was discarded;detect— traffic was seen but was not discarded. A new attack detection rule is being tested on the system, or traffic blocking is disabled for the IP address.
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To see detailed information about the attack, including attack-type, its speed, power, total number of packets sent, and volume, in the attack row, click the IP address of the network.
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Optional: If you observe a prolonged attack that disables or reduces service availability, change the IP address of the server.
Types of attacks
| Description | Target of attack | ||
|---|---|---|---|
| UDP flood to service DST port 565 limited | Attack UDP traffic on destination port 565 Whoami |
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| UDP flood to service DST port 1194 limited | UDP traffic attack on destination port 1194 OpenVPN | Exhaustion of bandwidth and computational resources of the attacked host; denial of service of the attacked application | |
| NTP Monlist Response | Attack by reflected and amplified UDP traffic from source port 123 (NTP Moonlist response vulnerability) | Bandwidth exhaustion | |
| SSDP Reflection | Reflection and amplified UDP attack on source port 1900 (SSDP and UPnP vulnerability) | Bandwidth exhaustion | |
| Empty UDP data | Attack of client IP address with Empty UDP datagrams Empty UDP Flood | Increased utilization of victim network | |
| Memcache | Attack by reflected and amplified UDP traffic from source port 11211 (Memcache vulnerability) | Bandwidth exhaustion | |
| SSRP Reflection | Reflected and amplified UDP traffic from source port 1434 SSRP (SQL Server Resolution Protocol) attack | Bandwidth exhaustion | |
| WSD Reflection | Reflection and amplified UDP traffic from source port 11211 (Memcache vulnerability) | Bandwidth exhaustion | |
| Net Assistant Reflection | Reflection and amplified UDP traffic from source port 3283 (Apple Network Assistant vulnerability) | Bandwidth exhaustion | |
| LowShadyPorts/Reflection flood to server limited | Rejection and amplified UDP traffic from source ports:
| Bandwidth exhaustion | |
| Custom UDP amplifications | Attack by reflected and amplified UDP traffic from source ports:
| Bandwidth exhaustion | |
| Custom UDP amplifications3 | Attack by reflected and amplified UDP traffic from source port 37021 SADP (Hikvision) | Bandwidth exhaustion | |
| Query Response/DNS query response reflection flood to server limited | DNS Response attack with traffic from public DNS servers with UDP DNS source port 53 and flags set from DNSSEC extension:
| Bandwidth exhaustion | |
| Source Port 53/UDP source port 53 reflection flood to server limited | Reflected and amplified UDP traffic from UDP DNS source port 53 | Bandwidth exhaustion | |
| Source Port 4500/UDP source port 4500 reflection flood to server limited | Reflection and amplified UDP traffic attack from source port 4500 | Bandwidth exhaustion | |
| Any Source Port/UDP source port reflection flood to server limited | High volume UDP traffic attack from a specific source port to any destination port on the client IP | Bandwidth exhaustion | |
| RST/TCP RST reflection flood to server limited | TCP traffic attack with TCP RST flag set from a specific source port to any destination port on client IP |
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| SYN/ACK/TCP SYN/ACK reflection flood to server limited | Attack TCP traffic with TCP RST flag set from a specific source port to any destination port on the client IP. | Exhaustion of network and computational resources of the attacked host | |
| PSH/ACK/TCP PSH/ACK reflection flood to server limited | Attack with TCP traffic with TCP RST or TCP PSH flags set from a specific source port to any destination port on the client IP. | Exhaustion of computational resources of the attacked host | |
| Failed Reflectors/ICMP Server flood to server limited | Attack of client host with large volume of ICMP response traffic from public servers, provoked by specific requests of attacker to public servers for availability of UDP ports, but with source address spoofing to client one. | Exhaustion of bandwidth and computational resources of the attacked host | |
| UDP flood to service DST port 53 limited | UDP traffic attack on destination port 53 DNS |
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| Any Destination Port/UDP service flood to a server port limited | High-volume UDP attack on any arbitrary victim port |
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| Any Type/ICMP/ICMPv6 service flood to a server limited | Attack with arbitrary ICMP traffic (including ICMPv6) of large volume on a specific destination port of the client. | Exhaustion of bandwidth and computational resources of the attacked host | |
| SYN/TCP SYN to a server port limited | Attack with TCP traffic with the TCP SYN flag set to a specific destination port on a client IP. |
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| RST/TCP RST to a server port limited | Attack with TCP traffic with TCP RST flag set to a specific destination port of a client IP. |
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| PSH/ACK/TCP PSH/ACK service flood to a server port limited | TCP traffic attack with TCP RST/PSH flags set on a specific destination port of a client IP | Exhaustion of computational resources of the attacked host | |
| Any TCP/TCP to a server port limited | Attack with arbitrary TCP traffic of large volume to a specific client port | Exhaustion of computational resources and bandwidth of the attacked host | |
| Fragment Under Attack/UDP server under attack | fragmentto server limited | Attack with fragmented UDP-datagrams. Usually accompanies other types of UDP attacks | Bandwidth exhaustion |
| Any Port/UDP server flood to server limited | Attack with arbitrary high-volume UDP traffic in aggregate on any client port | Exhaustion of the attacked host's computational resources and bandwidth | |
| Any Type/ICMP server flood to server limited | Attack with high-volume arbitrary ICMP traffic, including ICMPv6, any destination port of the client | Bandwidth and computational resources of the attacked host exhausted | |
| SYN/TCP SYN to server address limited | Attack with TCP traffic with TCP SYN flag set to any destination port of the client IP |
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| RST/TCP RST to server address limited | Attack by TCP traffic with TCP RST flag set to any destination port of client IP |
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| Any TCP/TCP to server address limited | Attack with arbitrary high-volume TCP traffic in aggregate on any destination port of the client | Exhaustion of network, computational resources of the attacked host and bandwidth | |
| IP protocol Any IP protocol Any IP protocol server flood to server limited | Attack with arbitrary high-volume IP traffic in aggregate on all transport protocols and all ports | Exhaustion of network and computational resources of the attacked host, computational resources of the attacked host and bandwidth | |
| Flex Fragment/Flex matched IP fragment to destination IP under attack | Rule defining blocking of IP packet fragments for hosts that are already under attack. Accompanies other types of attacks | - |