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You can try Nessus from Tenable, the greatest tool
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You can try Nessus from Tenable, the greatest tool

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Author abandoned. Since the author did not ask for a tool but (as the question indicated) for externals who would perform the test, I have excluded one suggestion from point division.
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Author abandoned. Since the author did not ask for a tool but (as the question indicated) for externals who would perform the test, I have excluded one suggestion from point division.

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I work for a small company with roughly 50 users and have been asked to have an outside vendor perform security/vulnerability testing. &nbsp;We have several servers, ranging from SQL, to Exchange, to Remote Desktop with a hosted firewall through Windstream. &nbsp;I thought I would appeal to the Experts in the Experts-Exchange community for advice and/or recommendations for a good vendor that specializes in such things.
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I work for a small company with roughly 50 users and have been asked to have an outside vendor perform security/vulnerability testing.  We have several servers, ranging from SQL, to Exchange, to Remote Desktop with a hosted firewall through Windstream.  I thought I would appeal to the Experts in the Experts-Exchange community for advice and/or recommendations for a good vendor that specializes in such things.

I am looking for a good company to do network vulnerability testing.

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.

Hardware Firewalls

This area is reserved for Experts Exchange testing.

Testing

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.

Security

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.

OS Security

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.