diff --git a/.env.example b/.env.example
index 9f05b4b..c6dace3 100644
--- a/.env.example
+++ b/.env.example
@@ -73,7 +73,10 @@ TRAEFIK_LOG_LEVEL=
 # If you want to run traefik non-privileged, use the following variable and the format [UID]:[GID] to set user and group of your choice.
 # Ensure that the user has access to docker.sock and traefik volumes defined in traefik/opencloud.yml
 #TRAEFIK_CONTAINER_UID_GID="1000:1000"
-
+# Configure ports for HTTP and HTTPS when necessary, defaults are 80 and 443
+# Don't use ports in the range of 8000-9999 and 5232 as those ports are used internally and therefore might create conflicts.
+#TRAEFIK_PORT_HTTP=4080
+#TRAEFIK_PORT_HTTPS=4443
 
 ## OpenCloud Settings ##
 # The opencloud container image.
diff --git a/config/opencloud/csp.yaml b/config/opencloud/csp.yaml
index 1616b5b..cde4b1e 100644
--- a/config/opencloud/csp.yaml
+++ b/config/opencloud/csp.yaml
@@ -4,10 +4,10 @@ directives:
   connect-src:
     - '''self'''
     - 'blob:'
-    - 'https://${COMPANION_DOMAIN|companion.opencloud.test}/'
-    - 'wss://${COMPANION_DOMAIN|companion.opencloud.test}/'
+    - 'https://${COMPANION_DOMAIN|companion.opencloud.test}${TRAEFIK_PORT_HTTPS}/'
+    - 'wss://${COMPANION_DOMAIN|companion.opencloud.test}${TRAEFIK_PORT_HTTPS}/'
     - 'https://raw.githubusercontent.com/opencloud-eu/awesome-apps/'
-    - 'https://${IDP_DOMAIN|keycloak.opencloud.test}/'
+    - 'https://${IDP_DOMAIN|keycloak.opencloud.test}${TRAEFIK_PORT_HTTPS}/'
     - 'https://update.opencloud.eu/'
   default-src:
     - '''none'''
@@ -20,7 +20,7 @@ directives:
     - 'blob:'
     - 'https://embed.diagrams.net/'
     # In contrary to bash and docker the default is given after the | character
-    - 'https://${COLLABORA_DOMAIN|collabora.opencloud.test}/'
+    - 'https://${COLLABORA_DOMAIN|collabora.opencloud.test}${TRAEFIK_PORT_HTTPS}/'
     # This is needed for the external-sites web extension when embedding sites
     - 'https://docs.opencloud.eu'
   img-src:
@@ -30,7 +30,7 @@ directives:
     - 'https://raw.githubusercontent.com/opencloud-eu/awesome-apps/'
     - 'https://tile.openstreetmap.org/'
     # In contrary to bash and docker the default is given after the | character
-    - 'https://${COLLABORA_DOMAIN|collabora.opencloud.test}/'
+    - 'https://${COLLABORA_DOMAIN|collabora.opencloud.test}${TRAEFIK_PORT_HTTPS}/'
   manifest-src:
     - '''self'''
   media-src:
@@ -41,7 +41,7 @@ directives:
   script-src:
     - '''self'''
     - '''unsafe-inline'''
-    - 'https://${IDP_DOMAIN|keycloak.opencloud.test}/'
+    - 'https://${IDP_DOMAIN|keycloak.opencloud.test}${TRAEFIK_PORT_HTTPS}/'
   style-src:
     - '''self'''
     - '''unsafe-inline'''
diff --git a/config/traefik/docker-entrypoint-override.sh b/config/traefik/docker-entrypoint-override.sh
index 456a62d..6b2e49e 100644
--- a/config/traefik/docker-entrypoint-override.sh
+++ b/config/traefik/docker-entrypoint-override.sh
@@ -14,10 +14,10 @@ add_arg "--log.level=${TRAEFIK_LOG_LEVEL:-ERROR}"
 # enable dashboard
 add_arg "--api.dashboard=true"
 # define entrypoints
-add_arg "--entryPoints.http.address=:80"
+add_arg "--entryPoints.http.address=:${TRAEFIK_PORT_HTTP:-80}"
 add_arg "--entryPoints.http.http.redirections.entryPoint.to=https"
 add_arg "--entryPoints.http.http.redirections.entryPoint.scheme=https"
-add_arg "--entryPoints.https.address=:443"
+add_arg "--entryPoints.https.address=:${TRAEFIK_PORT_HTTPS:-443}"
 # change default timeouts for long-running requests
 # this is needed for webdav clients that do not support the TUS protocol
 add_arg "--entryPoints.https.transport.respondingTimeouts.readTimeout=12h"
diff --git a/docker-compose.yml b/docker-compose.yml
index 79ac6ad..63f29a7 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -16,7 +16,7 @@ services:
     environment:
       # enable services that are not started automatically
       OC_ADD_RUN_SERVICES: ${START_ADDITIONAL_SERVICES}
-      OC_URL: https://${OC_DOMAIN:-cloud.opencloud.test}
+      OC_URL: https://${OC_DOMAIN:-cloud.opencloud.test}${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-}
       OC_LOG_LEVEL: ${LOG_LEVEL:-info}
       OC_LOG_COLOR: "${LOG_PRETTY:-false}"
       OC_LOG_PRETTY: "${LOG_PRETTY:-false}"
diff --git a/traefik/opencloud.yml b/traefik/opencloud.yml
index 4da9658..2f39ae0 100644
--- a/traefik/opencloud.yml
+++ b/traefik/opencloud.yml
@@ -23,9 +23,11 @@ services:
       - "TRAEFIK_ACME_CASERVER=${TRAEFIK_ACME_CASERVER:-https://acme-v02.api.letsencrypt.org/directory}"
       - "TRAEFIK_LOG_LEVEL=${TRAEFIK_LOG_LEVEL:-ERROR}"
       - "TRAEFIK_ACCESS_LOG=${TRAEFIK_ACCESS_LOG:-false}"
+      - "TRAEFIK_PORT_HTTP=${TRAEFIK_PORT_HTTP:-80}"
+      - "TRAEFIK_PORT_HTTPS=${TRAEFIK_PORT_HTTPS:-443}"
     ports:
-      - "80:80"
-      - "443:443"
+      - "${TRAEFIK_PORT_HTTP:-80}:${TRAEFIK_PORT_HTTP:-80}"
+      - "${TRAEFIK_PORT_HTTPS:-443}:${TRAEFIK_PORT_HTTPS:-443}"
     volumes:
       - "${DOCKER_SOCKET_PATH:-/var/run/docker.sock}:/var/run/docker.sock:ro"
       - "./config/traefik/docker-entrypoint-override.sh:/opt/traefik/bin/docker-entrypoint-override.sh"
diff --git a/weboffice/collabora.yml b/weboffice/collabora.yml
index e744077..ce6e9bd 100644
--- a/weboffice/collabora.yml
+++ b/weboffice/collabora.yml
@@ -5,6 +5,7 @@ services:
     environment:
       # this is needed for setting the correct CSP header
       COLLABORA_DOMAIN: ${COLLABORA_DOMAIN:-collabora.opencloud.test}
+      TRAEFIK_PORT_HTTPS: ${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-}
       # expose nats and the reva gateway for the collaboration service
       NATS_NATS_HOST: 0.0.0.0
       GATEWAY_GRPC_ADDR: 0.0.0.0:9142
@@ -30,15 +31,15 @@ services:
       COLLABORATION_HTTP_ADDR: 0.0.0.0:9300
       MICRO_REGISTRY: "nats-js-kv"
       MICRO_REGISTRY_ADDRESS: "opencloud:9233"
-      COLLABORATION_WOPI_SRC: https://${WOPISERVER_DOMAIN:-wopiserver.opencloud.test}
+      COLLABORATION_WOPI_SRC: https://${WOPISERVER_DOMAIN:-wopiserver.opencloud.test}${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-}
       COLLABORATION_APP_NAME: "CollaboraOnline"
       COLLABORATION_APP_PRODUCT: "Collabora"
-      COLLABORATION_APP_ADDR: https://${COLLABORA_DOMAIN:-collabora.opencloud.test}
-      COLLABORATION_APP_ICON: https://${COLLABORA_DOMAIN:-collabora.opencloud.test}/favicon.ico
+      COLLABORATION_APP_ADDR: https://${COLLABORA_DOMAIN:-collabora.opencloud.test}${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-}
+      COLLABORATION_APP_ICON: https://${COLLABORA_DOMAIN:-collabora.opencloud.test}${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-}/favicon.ico
       COLLABORATION_APP_INSECURE: "${INSECURE:-true}"
       COLLABORATION_CS3API_DATAGATEWAY_INSECURE: "${INSECURE:-true}"
       COLLABORATION_LOG_LEVEL: ${LOG_LEVEL:-info}
-      OC_URL: https://${OC_DOMAIN:-cloud.opencloud.test}
+      OC_URL: https://${OC_DOMAIN:-cloud.opencloud.test}${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-}
     volumes:
       # configure the .env file to use own paths instead of docker internal volumes
       - ${OC_CONFIG_DIR:-opencloud-config}:/etc/opencloud
@@ -52,15 +53,15 @@ services:
     networks:
       opencloud-net:
     environment:
-      aliasgroup1: https://${WOPISERVER_DOMAIN:-wopiserver.opencloud.test}:443
+      aliasgroup1: https://${WOPISERVER_DOMAIN:-wopiserver.opencloud.test}${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-}
       DONT_GEN_SSL_CERT: "YES"
       extra_params: |
         --o:ssl.enable=${COLLABORA_SSL_ENABLE:-true} \
         --o:ssl.ssl_verification=${COLLABORA_SSL_VERIFICATION:-true} \
         --o:ssl.termination=true \
         --o:welcome.enable=false \
-        --o:net.frame_ancestors=${OC_DOMAIN:-cloud.opencloud.test} \
-        --o:net.lok_allow.host[14]=${OC_DOMAIN-cloud.opencloud.test} \
+        --o:net.frame_ancestors=${OC_DOMAIN:-cloud.opencloud.test}${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-} \
+        --o:net.lok_allow.host[14]=${OC_DOMAIN-cloud.opencloud.test}${TRAEFIK_PORT_HTTPS:+:}${TRAEFIK_PORT_HTTPS:-} \
         --o:home_mode.enable=${COLLABORA_HOME_MODE:-false}
       username: ${COLLABORA_ADMIN_USER:-admin}
       password: ${COLLABORA_ADMIN_PASSWORD:-admin}