Network and service security
IT security and operational protection
Security should not be a collection of random restrictions. It should protect important data and services, limit the impact of an error or attack and still allow people to work normally.
Protection based on risk, not on fashionable labels
The same measure does not have the same value in every operation. The design starts with critical data and services, required access, public exposure and the ability to respond to an incident.
What I can cover
- Review of exposed services, accounts, access paths and basic weaknesses
- Firewall, network segmentation and separation of sensitive or technology areas
- Secure remote access, VPN and restriction of administration interfaces
- Updates, hardening and removal of unnecessary exposed services
- Logging, blocking of repeated attacks and monitoring of suspicious traffic
- Integration with backups, monitoring and incident procedures
Typical risk situations
- All network areas can access one another without restriction
- Public services or remote administration use outdated configuration
- Administrator accounts and former-user access are unclear
- Backups are accessible from the same environment as production data
Gradual reduction of real risk
The first priority is weaknesses that are easy to exploit and operationally significant. Service separation, access restrictions, monitoring and regular maintenance follow. Measures must be documented and manageable in daily operation.
Security is an ongoing process. New services, users and network changes can quickly alter the original situation, so regular review and integration with general IT management are important.
Outcome
Important services have a smaller attack surface, access paths are better separated and suspicious events are easier to investigate. Recovery is also considered for situations where preventive measures are not enough.