Probably not.  While many organizations rely on their firewall to protect them from Internet attacks, it is not enough.  A fully closed firewall would protect your network, but it would also close the Internet to your network.  So a port or ports must be opened in the firewall to provide a path for communication with outside  users.  These open ports enable an intruder to go in and out of the holes unchallenged.   

You could implement an Intrusion Detection Systems (IDS).   These systems provide another layer of protection, but they only record the event, not prevent it.  They simply page the network administrator and alert him of the intruder's presence so that the compromised port or ports can be shut down.  However, these systems can waste significant security administrator time responding to false-positive alerts.

You might consider a server based Intruder Prevention System.  However, Its server centric design increases initial installation and on-going administration costs.  Even more  importantly, while server based IPS solutions are effective at protecting the servers on the network, they do not protect the network itself.  The network is still vulnerable to malicious intruders.  Something more is needed.  

The Econet.com SentinelIPS takes Intrusion Prevention to the next level.  The SentinelIPS protects the open ports on your firewall by quickly identifying hackers and permanently blocking them from communicating with your servers.  The Sentinel is unique because it detects and responds to an attack while the attack is in progress.  Its proprietary technology actually recognizes the attack and stops it before any malicious packets reach your internal network elements.  Sentinel effectively "hangs up" on the attacker suspending the attack.  It is a true threat management - assessment, detection, and remediation system in one managed solution.

The Econet.com SentinelIPS inspects all Internet traffic entering your network for malicious code, prohibited behaviors, malformed packets, and hack attempts.   Once an attack is profiled, SentinelIPS drops all packets from the offending IP Address, including the initial request packets, so fast that the destination IP address appears dead or unused. 

During that time, SentinelIPS has inspected the packet, correlated it, logged the event, copied the packet for administrative use, sent an alert to the network administrator, the packet dropped and a new rule written to exclude the source IP address from accessing the network.  To the perpetrator, your Internet Gateway IP address will appear to be dead or unused.

The Econet.com SentinelIPS is both an appliance and a security management service.  Its standard features include 24/7 monitoring of the device, remote management services, update services, upgrades and enhancements.  There is not hardware or maintenance contracts to buy.  We simply install the SentinelIPS outside your firewall and configure it to your network protection specifications.  From then on, you simply pay a low monthly fee for each month that you keep the SentinelIPS in place. 

Your security administrator can access the EcoNet Sentinel's easy-to-use administration tool using any authenticated web browser. There, he can unlock IP addresses, create white lists, set up priority alerts, and review standardized reports on network activity.