#network-troubleshooting

Windows Event ID 5050 – DNS Client: DNS Client Service Failed to Start

Event ID 5050 indicates the DNS Client service failed to initialize or start properly, causing name resolution failures and network connectivity issues across Windows systems.

Windows Event ID 4978 – Security: IPsec Main Mode Negotiation Failed

Event ID 4978 indicates that IPsec Main Mode negotiation failed during the establishment of a secure connection. This security event occurs when two endpoints cannot agree on cryptographic parameters or authentication methods.

Windows Event ID 8303 – DNS Client: DNS Query Timeout or Resolution Failure

Event ID 8303 indicates DNS query timeouts or resolution failures from the DNS Client service, typically occurring when domain name lookups fail or exceed timeout thresholds.

Windows Event ID 902 – DNS Client: DNS Query Timeout or Resolution Failure

Event ID 902 indicates DNS client query timeouts or resolution failures when Windows cannot resolve domain names within the configured timeout period.

Windows Event ID 264 – DNS Client: DNS Query Response Timeout

Event ID 264 indicates DNS query timeouts from the Windows DNS Client service, typically occurring when DNS servers fail to respond within the configured timeout period.

Windows Event ID 2020 – DNS Client: DNS Query Response Timeout

Event ID 2020 indicates DNS query timeouts from the Windows DNS Client service. This warning event fires when DNS resolution requests exceed configured timeout thresholds, potentially impacting network connectivity and domain operations.