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SSL connection failed

The ROOT error message SSL connection failed means that a secure SSL/TLS connection could not be successfully established between a client and a server. This is a global runtime and network-level failure that occurs before application data is transmitted. It is commonly encountered across Linux and Windows systems, Java and Spring Boot applications, Docker containers, web servers, APIs, databases, and cloud services that rely on encrypted communication such as HTTPS. When does this error occur? When connecting to an HTTPS service with an invalid or expired SSL certificate When the client and server do not support a common TLS version When required CA certificates are missing from the system or application trust store When a proxy, firewall, or load balancer interferes with SSL traffic When server-side SSL configuration is incorrect Root cause of SSL connection failed At the operating system and runtime level, SSL connection failed occurs when the SSL/TLS negot...
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TLS handshake failed

The ROOT error message TLS handshake failed indicates that a secure connection could not be established between a client and a server. This error occurs at the network and runtime level during the Transport Layer Security (TLS) negotiation phase, before any application data is exchanged. It is commonly seen across Linux and Windows systems, Java and Spring Boot applications, Docker containers, web servers, APIs, databases, and cloud-based services that rely on HTTPS or encrypted communication. When does this error occur? When a client connects to a server using HTTPS but the TLS versions are incompatible When SSL/TLS certificates are expired, invalid, or untrusted When a server is misconfigured to use unsupported ciphers When Java or system trust stores are missing required CA certificates When network security devices interrupt encrypted traffic Root cause of TLS handshake failed At the OS and runtime level, TLS handshake failed occurs when the client and ser...
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Proxy error

The Proxy error indicates a failure in communication between a client-facing server and an upstream server through a proxy. This is a global network and runtime-level error that commonly appears in web servers, APIs, cloud platforms, Java and Spring Boot applications, Docker environments, and enterprise systems. A Proxy error means the proxy server received the request but could not successfully forward it or receive a valid response from the backend service. When does this error occur? A reverse proxy cannot connect to the upstream application server The backend service is down or unreachable Incorrect proxy configuration or routing rules Network firewall or security group blocks backend traffic Timeouts or protocol mismatches between proxy and service Root cause of Proxy error The root cause of Proxy error is a breakdown in the proxy-to-upstream communication path. This can occur due to stopped services, incorrect host or port configuration, DNS resolution ...
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Service unavailable

The Service unavailable error means that a server is currently unable to handle the request. This is a global runtime and network-level error that usually occurs when a service is temporarily overloaded, down for maintenance, or unable to communicate with required upstream components. The Service unavailable error is commonly seen across Linux and Windows servers, Java and Spring Boot applications, Docker containers, cloud platforms, APIs, databases, and load-balanced systems. When does this error occur? An application server is overloaded and cannot accept new requests A backend service is stopped or restarting A load balancer routes traffic to unhealthy instances A service is intentionally placed in maintenance mode A dependent service such as a database or cache is unavailable Root cause of Service unavailable The root cause of Service unavailable is the temporary inability of a service to process requests. This can be due to high CPU or memory usage, exha...
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Gateway timeout

The Gateway timeout error means that a server acting as a gateway or proxy did not receive a response from an upstream server within the allowed time limit. This is a global network-level error commonly seen in web applications, APIs, cloud platforms, Java and Spring Boot services, Docker environments, databases, and enterprise servers. When a Gateway timeout occurs, the request reaches an intermediate server successfully, but the final backend service fails to respond in time. When does this error occur? An API gateway waits too long for a backend service response A reverse proxy forwards a request to a slow or overloaded server A load balancer routes traffic to an unhealthy application instance A database query or external API call exceeds the timeout limit A containerized service is running but not responding on time Root cause of Gateway timeout The root cause of Gateway timeout is a delay or failure in communication between a gateway server and an upstre...
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Bad gateway

The Bad gateway error means that a server acting as a gateway or proxy received an invalid or no response from an upstream server. This is a global ROOT-level error that commonly appears in web servers, APIs, load balancers, and reverse proxy setups. It can occur across Linux and Windows systems, Java and Spring Boot applications, Docker containers, cloud platforms, and microservice architectures when inter-service communication fails. When does this error occur? A reverse proxy forwards a request to an upstream service that is down An API gateway cannot get a valid response from a backend service Timeouts or connection resets between proxy and upstream server Misconfigured upstream host, port, or protocol Overloaded backend services failing to respond correctly Root cause of Bad gateway At the network and application boundary, Bad gateway occurs when an intermediary server successfully receives a client request but fails to obtain a valid response from the ne...
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Destination host unreachable

The Destination host unreachable error means that a network packet could not be delivered to the target host because the network stack determined that the destination cannot be reached. This is a global ROOT-level network error that occurs across Linux and Windows systems, Docker containers, virtual machines, cloud servers, and applications such as Java, Spring Boot, databases, and network services. It indicates a routing or reachability failure rather than an application-level problem. When does this error occur? Sending traffic to an IP address that is not reachable on the network Incorrect default gateway or routing table configuration Target host is down or disconnected from the network ARP resolution failure on local networks Firewall or network security rules blocking traffic Root cause of Destination host unreachable At the OS and network level, Destination host unreachable is generated when the network stack or an intermediate router determines that th...
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