diff --git a/docs/content/config/troubleshooting/faq.md b/docs/content/config/troubleshooting/faq.md
index ec7f569f..3c84f574 100644
--- a/docs/content/config/troubleshooting/faq.md
+++ b/docs/content/config/troubleshooting/faq.md
@@ -78,4 +78,16 @@ If we're blind, we won't be able to do anything.
 
 ### Is `docker-mailserver` running in a [rancher environment](http://rancher.com/rancher/)?
 
-Yes, by Adding the Environment Variable `PERMIT_DOCKER: network`.
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+Yes, by Adding the Environment Variable `PERMIT_DOCKER: network`.
+
+### Common errors
+
+```
+warning: connect to Milter service inet:localhost:8893: Connection refused
+# DMARC not running
+# => /etc/init.d/opendmarc restart
+
+warning: connect to Milter service inet:localhost:8891: Connection refused
+# DKIM not running
+# => /etc/init.d/opendkim restart
+```
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