diff --git a/Dockerfile b/Dockerfile
index 4c9021b..49324b1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,6 +20,6 @@ RUN mkdir /app
 COPY --from=builder /app/target/release/friendolls-server /app/friendolls-server
 
 USER friendolls
-ENV BIND_ADDR=0.0.0.0:3000
-EXPOSE 3000
+ENV BIND_ADDR=0.0.0.0:27520
+EXPOSE 27520
 ENTRYPOINT ["/app/friendolls-server"]
diff --git a/src-common/src/lib.rs b/src-common/src/lib.rs
index 247bd65..e708208 100644
--- a/src-common/src/lib.rs
+++ b/src-common/src/lib.rs
@@ -2,6 +2,7 @@ use serde::{Deserialize, Serialize};
 use specta::Type;
 
 pub const VERSION: u8 = 4;
+pub const DEFAULT_SERVER_PORT: u16 = 27_520;
 pub const MAX_INTERACTION_PAYLOAD_BYTES: usize = 160 * 1024;
 pub const MAX_IMAGE_B64_SIZE: usize = 150 * 1024;
 pub const MAX_SKIN_B64_SIZE: usize = 96 * 1024;
diff --git a/src-server/src/main.rs b/src-server/src/main.rs
index 080196b..bedbf48 100644
--- a/src-server/src/main.rs
+++ b/src-server/src/main.rs
@@ -1,10 +1,12 @@
 use axum::{Router, http::StatusCode, routing::get};
+use friendolls_common::DEFAULT_SERVER_PORT;
 
 mod network;
 
 #[tokio::main]
 async fn main() -> std::io::Result<()> {
-    let bind_addr = std::env::var("BIND_ADDR").unwrap_or_else(|_| "127.0.0.1:3000".to_string());
+    let bind_addr =
+        std::env::var("BIND_ADDR").unwrap_or_else(|_| format!("127.0.0.1:{DEFAULT_SERVER_PORT}"));
     let listener = tokio::net::TcpListener::bind(&bind_addr).await?;
     let app = Router::new()
         .route("/", get("ok"))
diff --git a/src-tauri/src/network/connection.rs b/src-tauri/src/network/connection.rs
index 1935ade..af1a52b 100644
--- a/src-tauri/src/network/connection.rs
+++ b/src-tauri/src/network/connection.rs
@@ -2,8 +2,8 @@ use std::collections::HashMap;
 use std::time::Duration;
 
 use friendolls_common::{
-    ClientMessage, InteractionDeliveryStatus, Profile, ServerMessage, friends_bytes,
-    interaction_bytes, message_bytes, profile_bytes, register_bytes,
+    ClientMessage, DEFAULT_SERVER_PORT, InteractionDeliveryStatus, Profile, ServerMessage,
+    friends_bytes, interaction_bytes, message_bytes, profile_bytes, register_bytes,
 };
 use futures_util::{SinkExt, StreamExt};
 use tauri::{AppHandle, Manager};
@@ -402,9 +402,37 @@ fn url(remote: &Remote) -> String {
     } else {
         "ws"
     };
-    let port = remote
-        .port
-        .map(|port| format!(":{port}"))
-        .unwrap_or_default();
-    format!("{scheme}://{address}{port}/v1/ws")
+    let port = remote.port.unwrap_or(DEFAULT_SERVER_PORT);
+    format!("{scheme}://{address}:{port}/v1/ws")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn remote(address: &str, port: Option<u16>) -> Remote {
+        Remote {
+            id: "remote-id".to_owned(),
+            address: address.to_owned(),
+            name: None,
+            port,
+            priority: 0,
+        }
+    }
+
+    #[test]
+    fn url_uses_default_server_port_when_unspecified() {
+        assert_eq!(
+            url(&remote("example.net", None)),
+            "ws://example.net:27520/v1/ws"
+        );
+    }
+
+    #[test]
+    fn url_preserves_explicit_port() {
+        assert_eq!(
+            url(&remote("https://example.net", Some(443))),
+            "wss://example.net:443/v1/ws"
+        );
+    }
 }
diff --git a/src/routes/control-panel/add/network/+page.svelte b/src/routes/control-panel/add/network/+page.svelte
index 02ea6c1..0ef7993 100644
--- a/src/routes/control-panel/add/network/+page.svelte
+++ b/src/routes/control-panel/add/network/+page.svelte
@@ -94,7 +94,7 @@
         min="1"
         max="65535"
         inputmode="numeric"
-        placeholder="Default"
+        placeholder="27520"
       />
     </fieldset>
   </div>
diff --git a/src/routes/control-panel/edit/network/[id]/+page.svelte b/src/routes/control-panel/edit/network/[id]/+page.svelte
index 67c1c65..9c41015 100644
--- a/src/routes/control-panel/edit/network/[id]/+page.svelte
+++ b/src/routes/control-panel/edit/network/[id]/+page.svelte
@@ -150,9 +150,8 @@
         min="1"
         max="65535"
         inputmode="numeric"
-        placeholder="Default"
+        placeholder="27520"
       />
-      <p class="fieldset-label">Leave port blank to use the server default.</p>
     </fieldset>
   </div>
 
diff --git a/src/routes/onboarding/components/server-step.svelte b/src/routes/onboarding/components/server-step.svelte
index 23d7a7d..5091b16 100644
--- a/src/routes/onboarding/components/server-step.svelte
+++ b/src/routes/onboarding/components/server-step.svelte
@@ -49,7 +49,7 @@
     min="1"
     max="65535"
     inputmode="numeric"
-    placeholder="Default"
+    placeholder="27520"
     disabled={busy}
   />
 </fieldset>