diff --git a/group_vars/matrix_servers b/group_vars/matrix_servers
index d58f4dda3..cfca8c92f 100755
--- a/group_vars/matrix_servers
+++ b/group_vars/matrix_servers
@@ -1720,7 +1720,8 @@ matrix_synapse_account_threepid_delegates_msisdn: "{{ 'http://matrix-ma1sd:' + m
 matrix_synapse_container_client_api_host_bind_port: "{{ '' if matrix_nginx_proxy_enabled else '127.0.0.1:8008' }}"
 #
 # For exposing the Matrix Federation API's plain port (plain HTTP) to the local host.
-matrix_synapse_container_federation_api_plain_host_bind_port: "{{ '' if matrix_nginx_proxy_enabled else '127.0.0.1:8048' }}"
+matrix_synapse_container_default_federation_port: 8048
+matrix_synapse_container_federation_api_plain_host_bind_port: "{{ '' if matrix_nginx_proxy_enabled else '127.0.0.1:' + matrix_synapse_container_default_federation_port|string }}"
 #
 # For exposing the Matrix Federation API's TLS port (HTTPS) to the internet on all network interfaces.
 matrix_synapse_container_federation_api_tls_host_bind_port: "{{ matrix_federation_public_port if (matrix_synapse_federation_enabled and matrix_synapse_tls_federation_listener_enabled) else '' }}"
diff --git a/roles/matrix-dimension/defaults/main.yml b/roles/matrix-dimension/defaults/main.yml
index f7a84ca1d..a5e0bf1a4 100644
--- a/roles/matrix-dimension/defaults/main.yml
+++ b/roles/matrix-dimension/defaults/main.yml
@@ -39,7 +39,7 @@ matrix_dimension_integrations_rest_url: "https://{{ matrix_server_fqn_dimension
 matrix_dimension_integrations_widgets_urls: ["https://{{ matrix_server_fqn_dimension }}/widgets"]
 matrix_dimension_integrations_jitsi_widget_url: "https://{{ matrix_server_fqn_dimension }}/widgets/jitsi"
 
-matrix_dimension_homeserver_federationUrl: "http://matrix-synapse:8048"
+matrix_dimension_homeserver_federationUrl: ""http://matrix-synapse:{{matrix_synapse_container_default_federation_port|string}}""
 
 
 # Database-related configuration fields.
diff --git a/roles/matrix-nginx-proxy/defaults/main.yml b/roles/matrix-nginx-proxy/defaults/main.yml
index 3bb2723d8..af549b947 100644
--- a/roles/matrix-nginx-proxy/defaults/main.yml
+++ b/roles/matrix-nginx-proxy/defaults/main.yml
@@ -116,8 +116,8 @@ matrix_nginx_proxy_proxy_synapse_enabled: false
 matrix_nginx_proxy_proxy_synapse_hostname: "matrix-nginx-proxy"
 matrix_nginx_proxy_proxy_synapse_federation_api_enabled: "{{ matrix_nginx_proxy_proxy_matrix_federation_api_enabled }}"
 # The addresses where the Federation API is, when using Synapse.
-matrix_nginx_proxy_proxy_synapse_federation_api_addr_with_container: "matrix-synapse:8048"
-matrix_nginx_proxy_proxy_synapse_federation_api_addr_sans_container: "localhost:8048"
+matrix_nginx_proxy_proxy_synapse_federation_api_addr_with_container: "matrix-synapse:{{matrix_synapse_container_default_federation_port|string}}"
+matrix_nginx_proxy_proxy_synapse_federation_api_addr_sans_container: "localhost:{{matrix_synapse_container_default_federation_port|string}}"
 
 # Controls whether proxying the Element domain should be done.
 matrix_nginx_proxy_proxy_element_enabled: false
diff --git a/roles/matrix-synapse/defaults/main.yml b/roles/matrix-synapse/defaults/main.yml
index ce596c6bb..eb9d8e662 100644
--- a/roles/matrix-synapse/defaults/main.yml
+++ b/roles/matrix-synapse/defaults/main.yml
@@ -146,7 +146,7 @@ matrix_synapse_federation_rr_transactions_per_room_per_second: 50
 
 # Controls whether the TLS federation listener is enabled (tcp/8448).
 # Only makes sense if federation is enabled (`matrix_synapse_federation_enabled`).
-# Note that federation may potentially be enabled as non-TLS on tcp/8048 as well.
+# Note that federation may potentially be enabled as non-TLS on `matrix_synapse_container_default_federation_port` as well.
 # If you're serving Synapse behind an HTTPS-capable reverse-proxy,
 # you can disable the TLS listener (`matrix_synapse_tls_federation_listener_enabled: false`).
 matrix_synapse_tls_federation_listener_enabled: true
diff --git a/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2 b/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
index cebe7a1f6..2bfec1b4c 100644
--- a/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
+++ b/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
@@ -302,7 +302,7 @@ listeners:
 {% if matrix_synapse_federation_port_enabled %}
   # Unsecure HTTP listener (Federation API): for when matrix traffic passes through a reverse proxy
   # that unwraps TLS.
-  - port: 8048
+  - port: {{ matrix_synapse_container_default_federation_port }}
     tls: false
     bind_addresses: ['::']
     type: http
diff --git a/roles/matrix-synapse/templates/synapse/systemd/matrix-synapse.service.j2 b/roles/matrix-synapse/templates/synapse/systemd/matrix-synapse.service.j2
index 2fbaac7b5..d58f1f192 100644
--- a/roles/matrix-synapse/templates/synapse/systemd/matrix-synapse.service.j2
+++ b/roles/matrix-synapse/templates/synapse/systemd/matrix-synapse.service.j2
@@ -46,7 +46,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-synapse \
 			-p {{ matrix_synapse_container_federation_api_tls_host_bind_port }}:8448 \
 			{% endif %}
 			{% if matrix_synapse_federation_enabled and matrix_synapse_container_federation_api_plain_host_bind_port %}
-			-p {{ matrix_synapse_container_federation_api_plain_host_bind_port }}:8048 \
+			-p {{ matrix_synapse_container_federation_api_plain_host_bind_port }}:{{ matrix_synapse_container_default_federation_port }} \
 			{% endif %}
 			{% if matrix_synapse_metrics_enabled and matrix_synapse_container_metrics_api_host_bind_port %}
 			-p {{ matrix_synapse_container_metrics_api_host_bind_port }}:{{ matrix_synapse_metrics_port }} \