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A connection limit policy can be configured for an array or a standalone Forefront TMG server. A connection limit policy includes the following categories of connection limits:
Connection limits, that establish how many TCP connect requests and HTTP requests are allowed from a single IP address, that is not included in the list of IP address exceptions during one minute.

Connection limits, that establish how many concurrent transport-layer protocol connections may be accepted from a single IP address, that is not included in the list of IP address exceptions. These include connection limits for TCP connections, UDP sessions, and ICMP and other raw IP connections.

Custom connection limits, that establish how many connect requests and how many concurrent transport-layer protocol connections may be accepted from a single special IP address, that is included in the list of IP address exceptions. IP address exceptions might include published servers, chained proxy servers, and network address translation (NAT) devices (routers), which would require many more connections than most other IP addresses. Custom connection limits are applied to TCP connections, UDP sessions, and ICMP and other raw IP connections.

ImportantImportant:
An attacker may generate a flood attack by using spoofed IP addresses that are included in the exception list.
When configuring a connection limit policy, consider the following:
When the TCP connection limit for an IP address is reached, no additional TCP connections are allowed for the IP address.

The UDP connection limit applies to sessions, rather than to connections. When the UDP connection limit for an IP address is reached, and an attempt is made to create an additional UDP session from that IP address, the oldest UDP session that was created from the applicable IP address is closed, and the new session is established.

When the limit that restricts the number of connections that are created for a single rule during the current second is reached, no new connections are created for traffic that has no connection associated with it, the packets are dropped, and Forefront TMG generates an event that can trigger a "Connection Limit for a Rule Exceeded" alert. After the current second passes, the counter is reset, and new connections can be created during the next second until the limit is reached again.

Only connection attempts that are allowed by the firewall policy are counted for the connection limits described above.

Additional connection limits for traffic handled by the Web Proxy Filter can be configured in the properties of each Web listener, and in the Web Proxy properties of each network from which outgoing Web requests can be sent.

When you specify a connection limit on a Web listener, you limit the number of connections allowed to Web sites published using the specific Web listener. Web listeners are used in Web publishing rules, and one Web listener may be used in multiple rules.

When you specify a connection limit in the Web proxy properties of a specific network, you limit the number of concurrent outgoing Web connections that are allowed from the network on port 80 at any specific time.

In addition to flood attack and worm propagation mitigation, you can also limit the number of Web proxy connections allowed simultaneously to the Forefront TMG server to control allocation of the system's resources. This is particularly useful when publishing Web servers. Using connection limits, you can limit the number of computers that connect, while allowing specific clients to continue connecting even when the limit is surpassed.





              

                       

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oneslink4/19/2019Le procureur spécial américain Robert Mueller a livré ses conclusions dans un rapport de 448 pages sur l'ingérence russe dans la campagne présidentielle américaine de 2016