You manage several cloud-based servers. Users report that attempts to access a company website end in errors. Domain names fail to resolve, and logs show repeated timeouts when communicating with name resolution systems. The external provider insists their equipment is functioning. What is the most likely cause and how should you address it?
The server's clock is offset from valid reference values. Correct time settings on the instance.
A missing route entry is blocking access to the outside network. Install a default gateway route.
Improper address translation is altering source IP details. Remove address translation on the subnet.
A restrictive rule set is preventing outbound communications. Adjust firewall and security group settings to permit traffic.
When name resolution fails, reviewing firewall and security group settings is a high priority. Restrictive rules can block required network traffic, causing resolution failures. Ensuring that inbound and outbound traffic rules are properly configured allows successful lookup of domain names. Missing route entries frequently result in a total lack of external connectivity. Time misalignment typically leads to certificate or authentication problems, not resolution delays. Address translation errors usually present incorrect source or destination translations rather than timeouts.
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What are firewall and security group settings in a cloud environment?
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How do restrictive firewall or security group rules block name resolution traffic?
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Why does time offset typically affect certificates and authentication but not name resolution?