diff --git a/doc/Installation/Installation-CentOS-7-Apache.md b/doc/Installation/Installation-CentOS-7-Apache.md
index c930ad2d7f..35ff969ac2 100644
--- a/doc/Installation/Installation-CentOS-7-Apache.md
+++ b/doc/Installation/Installation-CentOS-7-Apache.md
@@ -106,6 +106,13 @@ Add the following config:
     setsebool -P httpd_can_network_connect=1
 ```
 
+#### Allow access through firewall
+
+```bash
+firewall-cmd --zone public --add-service http
+firewall-cmd --permanent --zone public --add-service http
+```
+
 #### Restart Web server
 
 ```bash
diff --git a/doc/Installation/Installation-CentOS-7-Nginx.md b/doc/Installation/Installation-CentOS-7-Nginx.md
index 06d9927c2b..c4ae1f0f02 100644
--- a/doc/Installation/Installation-CentOS-7-Nginx.md
+++ b/doc/Installation/Installation-CentOS-7-Nginx.md
@@ -131,6 +131,13 @@ server {
     setsebool -P httpd_can_sendmail=1
 ```
 
+#### Allow access through firewall
+
+```bash
+firewall-cmd --zone public --add-service http
+firewall-cmd --permanent --zone public --add-service http
+```
+
 #### Restart Web server
 
 ```bash