Web Reference: Aug 9, 2016 · Try starting SQL Developer again. You can go back into your renamed folder to recover things as needed if starting fresh fixes the issue. Sign up to request clarification or add additional context in comments. Aug 14, 2019 · I am unable to start sqldeveloper, any version. I have used it heavily for a few years, however when I came in to work this morning it will not start. My environment is Win7 x64 Enterprise, with 64-bit Java 8 installed as the JDK. Jan 16, 2026 · The “Network Adapter could not establish the connection” error in SQL Developer is often rooted in port 1521 connectivity issues. By systematically verifying the listener configuration, server firewall rules, and network path, you can resolve most port-related problems.
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