GITBOOK-426: change request with no subject merged in GitBook

Author: defguard-community

SUMMARY.md

@@ -143,5 +143,3 @@
   * [Client Windows installer exit codes](resources/troubleshooting/windows-installer-exit-codes.md)
   * [Client "All traffic" connection issues](resources/troubleshooting/client-all-traffic-connection-issues.md)
   * [WebAuthn security keys](resources/troubleshooting/webauthn-security-keys.md)
-  * [Unable to sign in to your defguard instance with correct credentials](resources/troubleshooting/unable-to-sign-in-to-your-defguard-instance-with-correct-credentials.md)
-  * ["No buffer space available" error in the gateway logs](resources/troubleshooting/no-buffer-space-available-error-in-the-gateway-logs.md)

help/overwiew.md

@@ -1,17 +1,3 @@
----
-layout:
-  title:
-    visible: true
-  description:
-    visible: true
-  tableOfContents:
-    visible: true
-  outline:
-    visible: true
-  pagination:
-    visible: true
----
-
 # Overview
 
 ## Welcome to defguard end-user documentation

resources/troubleshooting/README.md

@@ -170,3 +170,11 @@ From there, what happens to this traffic is the **administrator role.** The most
 
 * add routing rules, so that the traffic from that interface/VPN IP network gets routed to your network - this approach gives the advantage that users VPN ip persists in the network and the user is visible with it's VPN ip in your local network
 * Masquerade or NAT - a common use case is to masquerade or NAT the traffic - which is **actually required if you want users to access Internet from the VPN -** this process is [described in detailed in this tutorial](../../tutorials/step-by-step-setting-up-a-vpn-server/#enabling-to-access-internet-through-your-vpn).
+
+## Unable to sign in to your defguard instance with correct credentials
+
+The user tries to sign in to a defguard instance but gets a 401 response with message "Session is required".
+
+This issue is most likely caused by a misconfigured `DEFGUARD_URL` . Please take a look at the configuration options described in [General configuration](../../configuration.md#general-configuration) documentation.
+
+If you want to access your defguard instance without TLS (using an `http://` URL), please also make sure you have everything configured according to [Auth cookies configuration](../../configuration.md#auth-cookies-configuration) documentation.