# PortUnreachableException

- **ID:** `java/portunreachableexception`
- **Domain:** java
- **Category:** network_error
- **Error Code:** `PortUnreachableException`
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

ICMP Port Unreachable received. Target port is not open.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 8+ | active | — | — |