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Matteo I'm having the same problem, but when I try to use the filter smtp.rsp.parameter contains &quot;Authentication Unsuccessful&quot; in wireshark I just get an error message that says Invalid Capture filter. what to do?<br />
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Please see attached image.<br />
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invalid-capture-filter.jpg

Matteo I'm having the same problem, but when I try to use the filter smtp.rsp.parameter contains "Authentication Unsuccessful" in wireshark I just get an error message that says Invalid Capture filter. what to do?

Please see attached image.

Invalid capture filter error message in wireshark

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.

Network Security

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

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.