diff --git a/conf/nginx-alldomains.conf b/conf/nginx-alldomains.conf
index 1db7606c..be1bca3a 100644
--- a/conf/nginx-alldomains.conf
+++ b/conf/nginx-alldomains.conf
@@ -36,6 +36,7 @@
 		fastcgi_split_path_info ^/mail(/.*)()$;
 		fastcgi_index index.php;
 		fastcgi_param SCRIPT_FILENAME /usr/local/lib/roundcubemail/$fastcgi_script_name;
+		fastcgi_param HTTP_PROXY  "";
 		fastcgi_pass php-fpm;
 
 		# Outgoing mail also goes through this endpoint, so increase the maximum
@@ -48,6 +49,7 @@
 		include /etc/nginx/fastcgi_params;
 		fastcgi_param SCRIPT_FILENAME /usr/local/lib/z-push/index.php;
 		fastcgi_param PHP_VALUE "include_path=.:/usr/share/php:/usr/share/pear:/usr/share/awl/inc";
+		fastcgi_param HTTP_PROXY  "";
 		fastcgi_read_timeout 630;
 		fastcgi_pass php-fpm;
 
@@ -59,6 +61,7 @@
 		include fastcgi_params;
 		fastcgi_param SCRIPT_FILENAME /usr/local/lib/z-push/autodiscover/autodiscover.php;
 		fastcgi_param PHP_VALUE "include_path=.:/usr/share/php:/usr/share/pear:/usr/share/awl/inc";
+		fastcgi_param HTTP_PROXY  "";
 		fastcgi_pass php-fpm;
 	}
 
diff --git a/conf/nginx-primaryonly.conf b/conf/nginx-primaryonly.conf
index da41cec9..1f63d302 100644
--- a/conf/nginx-primaryonly.conf
+++ b/conf/nginx-primaryonly.conf
@@ -6,6 +6,7 @@
 	location /admin/ {
 		proxy_pass http://127.0.0.1:10222/;
 		proxy_set_header X-Forwarded-For $remote_addr;
+		proxy_set_header Proxy "";
 		add_header X-Frame-Options "DENY";
 		add_header X-Content-Type-Options nosniff;
 		add_header Content-Security-Policy "frame-ancestors 'none';";
@@ -39,6 +40,7 @@
 		fastcgi_param PATH_INFO $3;
 		fastcgi_param MOD_X_ACCEL_REDIRECT_ENABLED on;
 		fastcgi_param MOD_X_ACCEL_REDIRECT_PREFIX /owncloud-xaccel;
+		fastcgi_param HTTP_PROXY  "";
 		fastcgi_read_timeout 630;
 		fastcgi_pass php-fpm;
 		client_max_body_size 1G;
@@ -56,6 +58,7 @@
 		# Z-Push doesn't like getting a redirect, and a plain rewrite didn't work either.
 		# Properly proxying like this seems to work fine.
 		proxy_pass https://127.0.0.1/cloud/remote.php/$1;
+		proxy_set_header Proxy "";
 	}
 	rewrite ^/.well-known/host-meta /cloud/public.php?service=host-meta last;
 	rewrite ^/.well-known/host-meta.json /cloud/public.php?service=host-meta-json last;