fix(mysql): document too many connection error

src/_posts/databases/mysql/2000-01-01-accessing.md

@@ -297,4 +297,4 @@ like described [above](#using-openssh).
 {:start="5"}
 5. Click the **Test Connection** button at the bottom to test that everything
    works as expected
-6. Click the **OK** button to save the connection configuration
+6. Click the **OK** button to save the connection configuration

src/_posts/databases/mysql/2000-01-01-troubleshooting.md

@@ -1,7 +1,7 @@
 ---
 title: Troubleshooting Scalingo for MySQL®
 nav: Troubleshooting
-modified_at: 2024-04-23 12:00:00
+modified_at: 2025-08-14 12:00:00
 tags: databases mysql addon
 index: 9
 ---
@@ -158,3 +158,13 @@ with some general steps to address them:
 
 - Implement connection pooling to reuse database connections, reducing the
   overhead of establishing a new connection for each query.
+
+## Connection error
+
+Receiving the error `Too many connection errors from 1.2.3.4:12345` means 
+that the MySQL router blocked the connection after multiple failed 
+attempts using invalid credentials. 
+
+To solve this issue, the MySQL router has to be restarted, which induces a 
+small downtime of less than 30 seconds. To do so, please contact our Support 
+team at <support@scalingo.com> or via the integrated chat in your dashboard.