The last two decades have increased the needs for communication over the Internet for private and business purposes. With the development of computer networks and technologies, new forms of computer threats are being developed also. Companies that base their businesses on Internet use everything to ensure undisturbed workflow. There are technologies and solutions that companies implement to defend themselves from increasingly complex computer and network attacks and one of the options is to use the unified threat management. There are many vendors of computer and network equipment offering solutions and devices for unified threat management. The features that such devices characterize are described in detail in this paper. Analyzing the current market situation, as well as defining specific business needs, is crucial when choosing solutions for securing the company's computer network. The paper presents the complexity of a large company IT system that has its own server infrastructure and operates in many countries across Europe in over 50 locations. The advantages and disadvantages of the current Fortinet unified threat management solution, as well as similar solutions, are analyzed. Direct comparison of the two devices examines the functionality as well as the success of implementation in the company's current infrastructure. The tests were made in simulated conditions that represent the real needs of the company, in order to choose a possible solution for new distributed locations and effective protection against computer threats.