Merge pull request #149 from oracle-samples/148-troubleshooting-adb-behind-vpn

Add troubleshooting for ADB on VPN

Author: jdortiz

docs/content/help/troubleshooting/_index.md

@@ -35,4 +35,24 @@ Set a rate limit based on the API Key restrictions.
 During the Evaluation in the **Testbed**, a database error occurs: `DPY-4011: the database or network closed the connection`
 
 **_Solution_**:
-Increase the memory of the vector_memory_size.  If this is an Oracle Autonomous Database, scale up the CPU.
+Increase the memory of the vector_memory_size.  If this is an Oracle Autonomous Database, scale up the CPU.
+
+## Autonomous Database behind VPN
+
+**_Problem_**:
+Connection to an Autonomous database while inside a VPN fails.
+
+**_Solution_**:
+Update the database connection string to include a `https_proxy` and `https_proxy_port`.
+
+  For example:
+   
+  ```text
+  myadb_high = (
+  description=(
+      address=
+      (protocol=tcps)(port=1522)
+      (https_proxy=<proxy_host>)(https_proxy_port=<proxy_port>)  # <-- Add
+      (host=<adb_host>)
+  )(connect_data=(service_name=s<service_name>))(security=(ssl_server_dn_match=yes))
+  )```