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Mnay thanks for the suggestion. have put them in and seems to be doing it properly. Can see quite a lot of attempts beingblocked.
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Mnay thanks for the suggestion. have put them in and seems to be doing it properly. Can see quite a lot of attempts beingblocked.

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We are regularly getting smtp auth failures on our email gateway. it used to be 535 and have changed to 504 ever since we forced smtp/tls and blocked ssl and weak cipher. <br />
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Is there a custom signature to monitor and block this on the fortigate firewall. running 5.0.10 on 60D fortigate.
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We are regularly getting smtp auth failures on our email gateway. it used to be 535 and have changed to 504 ever since we forced smtp/tls and blocked ssl and weak cipher. 

Is there a custom signature to monitor and block this on the fortigate firewall. running 5.0.10 on 60D fortigate.

Custom IPS signature for Fortigate / block smtp auth failure

A vulnerability is a weakness which allows an attacker to reduce a system's information assurance. Vulnerability is the intersection of three elements: a system susceptibility or flaw, attacker access to the flaw, and attacker capability to exploit the flaw. To exploit a vulnerability, an attacker must have at least one applicable tool or technique that can connect to a system weakness, known as the attack surface. Vulnerability management is the cyclical practice of identifying, classifying, remediating, and mitigating vulnerabilities. Other vulnerabilities include security risks, security defects and constructs in programming languages that are difficult to use properly.

Vulnerabilities

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.