diff --git a/master/config/main.toml b/master/config/main.toml
index 37b3a99..bb47014 100644
--- a/master/config/main.toml
+++ b/master/config/main.toml
@@ -10,7 +10,7 @@ port = 27010
 
 [server.timeout]
 # Time in seconds while challenge is valid
-challenge = 300
+challenge = 10
 # Time in seconds while server is valid
 server = 300
 # TIme in seconds before next admin request is allowed after wrong password
@@ -18,10 +18,10 @@ admin = 10
 
 [client]
 # If client version is less then show update message
-version = "0.20"
+version = "0.19"
 update_title = "https://github.com/FWGS/xash3d-fwgs"
 update_map = "Update please"
-update_addr = "127.0.0.1:27010"
+update_addr = "mentality.rip:27010"
 
 [hash]
 len = 64
diff --git a/master/src/config.rs b/master/src/config.rs
index 5ca6641..afa52b5 100644
--- a/master/src/config.rs
+++ b/master/src/config.rs
@@ -3,7 +3,7 @@
 
 use std::fs;
 use std::io;
-use std::net::{IpAddr, Ipv4Addr, SocketAddrV4};
+use std::net::{IpAddr, Ipv4Addr};
 use std::path::Path;
 
 use log::LevelFilter;
@@ -16,6 +16,7 @@ pub const DEFAULT_CONFIG_PATH: &str = "config/main.toml";
 
 pub const DEFAULT_MASTER_SERVER_IP: IpAddr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
 pub const DEFAULT_MASTER_SERVER_PORT: u16 = 27010;
+pub const DEFAULT_CHALLENGE_TIMEOUT: u32 = 10;
 pub const DEFAULT_TIMEOUT: u32 = 300;
 pub const DEFAULT_ADMIN_TIMEOUT: u32 = 10;
 
@@ -83,7 +84,7 @@ impl Default for ServerConfig {
 #[derive(Deserialize, Debug)]
 #[serde(deny_unknown_fields)]
 pub struct TimeoutConfig {
-    #[serde(default = "default_timeout")]
+    #[serde(default = "default_challenge_timeout")]
     pub challenge: u32,
     #[serde(default = "default_timeout")]
     pub server: u32,
@@ -94,7 +95,7 @@ pub struct TimeoutConfig {
 impl Default for TimeoutConfig {
     fn default() -> Self {
         Self {
-            challenge: default_timeout(),
+            challenge: default_challenge_timeout(),
             server: default_timeout(),
             admin: default_admin_timeout(),
         }
@@ -112,7 +113,7 @@ pub struct ClientConfig {
     #[serde(default)]
     pub update_title: Box<str>,
     #[serde(default)]
-    pub update_addr: Option<SocketAddrV4>,
+    pub update_addr: Option<Box<str>>,
 }
 
 #[derive(Deserialize, Default, Debug)]
@@ -145,6 +146,10 @@ fn default_server_port() -> u16 {
     DEFAULT_MASTER_SERVER_PORT
 }
 
+fn default_challenge_timeout() -> u32 {
+    DEFAULT_CHALLENGE_TIMEOUT
+}
+
 fn default_timeout() -> u32 {
     DEFAULT_TIMEOUT
 }
diff --git a/master/src/master_server.rs b/master/src/master_server.rs
index 41708d4..e6de3c9 100644
--- a/master/src/master_server.rs
+++ b/master/src/master_server.rs
@@ -124,18 +124,51 @@ struct MasterServer {
     blocklist: HashSet<Ipv4Addr>,
 }
 
+fn resolve_socket_addr<A>(addr: A) -> io::Result<Option<SocketAddrV4>>
+where
+    A: ToSocketAddrs,
+{
+    for i in addr.to_socket_addrs()? {
+        match i {
+            SocketAddr::V4(i) => return Ok(Some(i)),
+            SocketAddr::V6(_) => {}
+        }
+    }
+    Ok(None)
+}
+
 impl MasterServer {
     fn new(cfg: Config) -> Result<Self, Error> {
         let addr = SocketAddr::new(cfg.server.ip, cfg.server.port);
         info!("Listen address: {}", addr);
         let sock = UdpSocket::bind(addr).map_err(Error::BindSocket)?;
-        let update_addr =
-            cfg.client
-                .update_addr
-                .unwrap_or_else(|| match sock.local_addr().unwrap() {
-                    SocketAddr::V4(addr) => addr,
-                    _ => todo!(),
-                });
+
+        let update_addr = {
+            let mut addr = None;
+
+            if let Some(update_addr) = cfg.client.update_addr {
+                addr = match resolve_socket_addr(&*update_addr) {
+                    Ok(None) => {
+                        error!(
+                            "update address: failed to resolve IPv4 for \"{}\"",
+                            update_addr
+                        );
+                        None
+                    }
+                    Err(e) => {
+                        error!("update address: {}", e);
+                        None
+                    }
+                    Ok(addr) => addr,
+                }
+            };
+
+            // fallback to local address
+            addr.unwrap_or_else(|| match sock.local_addr().unwrap() {
+                SocketAddr::V4(a) => a,
+                _ => todo!(),
+            })
+        };
 
         Ok(Self {
             sock,