Navicat連接失敗常見原因及解決方法：1. 檢查網(wǎng)絡(luò)連接是否穩(wěn)定，服務(wù)器是否在線，能否ping通，是否有防火牆阻止；2. 核對數(shù)據(jù)庫設(shè)置，包括主機名、端口、數(shù)據(jù)庫名、用戶名和密碼，確認服務(wù)器允許遠程連接且用戶有對應(yīng)訪問權(quán)限；3. 檢查服務(wù)器和本地的防火牆或安全軟件是否攔截數(shù)據(jù)庫端口，必要時聯(lián)繫IT部門；4. 通過命令行測試連接，判斷問題是否出在Navicat本身；5. 更新Navicat至最新版，重新配置連接配置文件，或嘗試重裝Navicat及其他數(shù)據(jù)庫工具以排除軟件故障。

Your Navicat connection might be failing for a few common reasons — and most of them aren't too hard to fix once you know what to check. The key is to systematically rule out possible issues, starting from the simplest ones.

1. Check Your Network Connection

Before diving into complex troubleshooting, make sure your device has a stable internet or local network connection. If you're connecting to a remote database server:

• Is the server online?
• Can you ping the server IP/domain (if allowed)?
• Are there any firewall rules blocking outgoing connections on your machine?

Sometimes it's not Navicat at fault — it's just that your computer can't reach the server in the first place.

2. Verify Database Server Settings

This is one of the most common sources of failure. Make sure all the details you entered in Navicat are correct:

• Hostname/IP address – Double-check for typos.
• Port number – MySQL defaults to 3306, PostgreSQL to 5432, etc. Some setups use custom ports.
• Database name – Optional in some cases, but if required and incorrect, it'll cause issues.
• Username & Password – Case-sensitive and easy to mistype.

Also, confirm that:

• The database server allows remote connections (not just localhost access).
• The user account you're using has access from your current IP.

If you're unsure about these settings, ask your hosting provider or system administrator.

3. Firewall and Security Software Interference

Even if everything looks good in Navicat, firewalls or security tools can block the connection silently. Here's what to do:

• Check the server-side firewall (like UFW or iptables) to ensure the database port is open.
• Temporarily disable local antivirus/firewall software to test if it's interfering.
• If you're on a corporate or restricted network, contact your IT department — they may block certain ports.

Sometimes the issue isn't with Navicat or the server, but something in between.

4. Test the Connection via Command Line

To see if the problem is specific to Navicat or more general, try connecting using a terminal or command prompt. For example, with MySQL:

 mysql -h your.hostname.or.ip -P 3306 -u youruser -p

Replace values with your own. If this fails, the issue is likely not with Navicat itself. If it works, then maybe Navicat is misconfigured or has a bug in that particular profile.

5. Update or Reinstall Navicat

Occasionally, bugs in the software can cause connection problems. Try the following:

• Update Navicat to the latest version.
• Delete and re-add the connection profile — sometimes corrupted config files mess things up.
• Reinstall Navicat if other connections work fine but one keeps failing unexpectedly.

Also, consider trying an alternative tool like DBeaver or even phpMyAdmin to test the same connection — this helps isolate whether the issue is with Navicat specifically.

That should cover most common causes. Most connection issues come down to simple typos, network blocks, or server-side restrictions. Once you go through each step methodically, you'll usually find the culprit pretty quickly.

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