diff --git a/changelog.d/999.bugfix b/changelog.d/999.bugfix
new file mode 100644
index 000000000..4c9d4dfd3
--- /dev/null
+++ b/changelog.d/999.bugfix
@@ -0,0 +1 @@
+Fix bugs in handling server names that includes colons
diff --git a/src/Connections/GenericHook.ts b/src/Connections/GenericHook.ts
index 2f0e831f7..17ed8e3b0 100644
--- a/src/Connections/GenericHook.ts
+++ b/src/Connections/GenericHook.ts
@@ -334,7 +334,7 @@ export class GenericHookConnection extends BaseConnection implements IConnection
         if (!this.config.userIdPrefix) {
             return this.intent.userId;
         }
-        const [, domain] = this.intent.userId.split(':');
+        const domain = this.intent.userId.substring(this.intent.userId.indexOf(':')+1);
         const name = this.state.name &&
              this.state.name.replace(/[A-Z]/g, (s) => s.toLowerCase()).replace(/([^a-z0-9\-.=_]+)/g, '');
         return `@${this.config.userIdPrefix}${name || 'bot'}:${domain}`;
diff --git a/src/config/permissions.rs b/src/config/permissions.rs
index 63997a191..938dc92f1 100644
--- a/src/config/permissions.rs
+++ b/src/config/permissions.rs
@@ -100,12 +100,10 @@ impl BridgePermissions {
         service: String,
         permission: String,
     ) -> napi::Result<bool> {
-        let parts: Vec<&str> = mxid.split(':').collect();
         let permission_int = permission_level_to_int(permission)?;
-        let domain = if parts.len() > 1 {
-            parts[1].to_string()
-        } else {
-            parts[0].to_string()
+        let domain: String = match mxid.split_once(':') {
+            Some((.., d)) => d.to_string(),
+            None => return Ok(false),
         };
         for actor_permission in self.config.iter() {
             // Room_id
@@ -128,12 +126,10 @@ impl BridgePermissions {
 
     #[napi]
     pub fn check_action_any(&self, mxid: String, permission: String) -> napi::Result<bool> {
-        let parts: Vec<&str> = mxid.split(':').collect();
         let permission_int = permission_level_to_int(permission)?;
-        let domain = if parts.len() > 1 {
-            parts[1].to_string()
-        } else {
-            parts[0].to_string()
+        let domain: String = match mxid.split_once(':') {
+            Some((.., d)) => d.to_string(),
+            None => return Ok(false),
         };
         for actor_permission in self.config.iter() {
             if !self.match_actor(actor_permission, &domain, &mxid) {