diff --git a/README.md b/README.md
index 134081ebe118fe1a4af21deb9c39ceb59fdc8366..abcadbf69677d6d48f7252ad4539b3140580d725 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,8 @@ This script checks the ip connectivity in connection with onboarded universities
 * The script runs as a daily scheduled gitlab job. It passes the pipelinie only if all ip connections are checked "ok".
 * The logs can be seen in the pipeline logs.
 * Users can set up merge requests for correcting/updating IP addresses.
+
+## Troubleshooting ECSs
+
+### 403 Forbidden error
+Shoud the ECS Management Endpoint return a `403 Forbidden` error, but the Web UI can be used with the same credentials, make sure that this guide bei Dell is or was used: https://www.dell.com/support/kbdoc/en-us/000205031/ecs-how-to-perform-host-header-injection-for-3-8-x
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