--- overleaf.conf
+++ overleaf.conf
@@ -10,7 +10,7 @@ server {
 	}

 	location / {
-		proxy_pass http://localhost:4000;
+		proxy_pass http://127.0.0.1:4000;
 		proxy_http_version 1.1;
 		proxy_set_header Upgrade $http_upgrade;
 		proxy_set_header Connection "upgrade";
@@ -22,7 +22,7 @@ server {
 	}

 	location /socket.io {
-		proxy_pass http://localhost:3026;
+		proxy_pass http://127.0.0.1:3026;
 		proxy_http_version 1.1;
 		proxy_set_header Upgrade $http_upgrade;
 		proxy_set_header Connection "upgrade";
@@ -48,22 +48,22 @@ server {

   # handle output files for specific users
   location ~ ^/project/([0-9a-f]+)/user/([0-9a-f]+)/build/([0-9a-f-]+)/output/output\.([a-z]+)$ {
-		proxy_pass http://localhost:8080; # clsi-nginx.conf
+		proxy_pass http://127.0.0.1:8080; # clsi-nginx.conf
 		proxy_http_version 1.1;
   }
   # handle output files for anonymous users
   location ~ ^/project/([0-9a-f]+)/build/([0-9a-f-]+)/output/output\.([a-z]+)$ {
-		proxy_pass http://localhost:8080; # clsi-nginx.conf
+		proxy_pass http://127.0.0.1:8080; # clsi-nginx.conf
 		proxy_http_version 1.1;
   }
   # PDF range for specific users
   location ~ ^/project/([0-9a-f]+)/user/([0-9a-f]+)/content/([0-9a-f-]+/[0-9a-f]+)$ {
-		proxy_pass http://localhost:8080; # clsi-nginx.conf
+		proxy_pass http://127.0.0.1:8080; # clsi-nginx.conf
 		proxy_http_version 1.1;
   }
   # PDF range for anonymous users
   location ~ ^/project/([0-9a-f]+)/content/([0-9a-f-]+/[0-9a-f]+)$ {
-		proxy_pass http://localhost:8080; # clsi-nginx.conf
+		proxy_pass http://127.0.0.1:8080; # clsi-nginx.conf
 		proxy_http_version 1.1;
   }