diff --git a/dist/index.js b/dist/index.js
index a3d8453f..38877eec 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1181,6 +1181,7 @@
   );
   function connect() {
     if (cannotConnect.value == true) return;
+    serverAddressInput.value = serverAddressInput.value.toLowerCase();
     currentAddress.value = serverAddressInput.value;
     isConnected.value = false;
     didRequestConnection.value = true;
@@ -1202,8 +1203,9 @@
   }
   UDN.onconnect = () => {
     isConnected.value = true;
-    if (!previousAddresses.value.has(currentAddress.value)) {
-      previousAddresses.add(currentAddress.value);
+    const lowerCasedAddress = currentAddress.value.toLowerCase();
+    if (!previousAddresses.value.has(lowerCasedAddress)) {
+      previousAddresses.add(lowerCasedAddress);
     }
     subscribeChannels();
     if (mailboxId.value != "") UDN.connectMailbox(mailboxId.value);
diff --git a/src/Model/model.ts b/src/Model/model.ts
index 656780d3..de5f80bf 100644
--- a/src/Model/model.ts
+++ b/src/Model/model.ts
@@ -41,6 +41,7 @@ export const cannotResetAddress = React.createProxyState(
 export function connect(): void {
   if (cannotConnect.value == true) return;
 
+  serverAddressInput.value = serverAddressInput.value.toLowerCase();
   currentAddress.value = serverAddressInput.value;
 
   isConnected.value = false;
@@ -70,8 +71,9 @@ export function subscribeChannels() {
 // listeners
 UDN.onconnect = () => {
   isConnected.value = true;
-  if (!previousAddresses.value.has(currentAddress.value)) {
-    previousAddresses.add(currentAddress.value);
+  const lowerCasedAddress = currentAddress.value.toLowerCase();
+  if (!previousAddresses.value.has(lowerCasedAddress)) {
+    previousAddresses.add(lowerCasedAddress);
   }
 
   subscribeChannels();