diff --git a/common-files/src/main/resources/config.yml b/common-files/src/main/resources/config.yml
index 95815b4c5..4050974da 100644
--- a/common-files/src/main/resources/config.yml
+++ b/common-files/src/main/resources/config.yml
@@ -198,7 +198,8 @@ resource-pack:
         # Generates a single-use, time-limited download link for each player.
         one-time-token: true
         # Enhances validation for deny-non-minecraft-request and one-time-token.
-        strict-validation: true
+        # Do not enable this on an offline server
+        strict-validation: false
         rate-limiting:
           # Maximum bandwidth per second to prevent server instability for other players during resource pack downloads
           max-bandwidth-per-second: 5_000_000 # 5MB/s
diff --git a/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/SelfHost.java b/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/SelfHost.java
index 93cede575..9d08e7c78 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/SelfHost.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/SelfHost.java
@@ -77,7 +77,7 @@ public class SelfHost implements ResourcePackHost {
             boolean oneTimeToken = ResourceConfigUtils.getAsBoolean(arguments.getOrDefault("one-time-token", true), "one-time-token");
             String protocol = arguments.getOrDefault("protocol", "http").toString();
             boolean denyNonMinecraftRequest = ResourceConfigUtils.getAsBoolean(arguments.getOrDefault("deny-non-minecraft-request", true), "deny-non-minecraft-request");
-            boolean strictValidation = ResourceConfigUtils.getAsBoolean(arguments.getOrDefault("strict-validation", true), "strict-validation");
+            boolean strictValidation = ResourceConfigUtils.getAsBoolean(arguments.getOrDefault("strict-validation", false), "strict-validation");
 
             Bandwidth limit = null;
             Map<String, Object> rateLimitingSection = ResourceConfigUtils.getAsMapOrNull(arguments.get("rate-limiting"), "rate-limiting");
diff --git a/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/SelfHostHttpServer.java b/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/SelfHostHttpServer.java
index da20a14e3..39961f3aa 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/SelfHostHttpServer.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/SelfHostHttpServer.java
@@ -69,7 +69,7 @@ public class SelfHostHttpServer {
     private String url;
     private boolean denyNonMinecraft = true;
     private boolean useToken;
-    private boolean strictValidation = true;
+    private boolean strictValidation = false;
 
     private long globalUploadRateLimit = 0;
     private long minDownloadSpeed = 50_000;
@@ -234,7 +234,7 @@ public class SelfHostHttpServer {
                 boolean nonMinecraftClient = userAgent == null || !userAgent.startsWith("Minecraft Java/");
                 if (strictValidation && !nonMinecraftClient) {
                     String clientVersion = request.headers().get("X-Minecraft-Version");
-                    nonMinecraftClient = !Objects.equals(clientVersion, userAgent.substring(15));
+                    nonMinecraftClient = !Objects.equals(clientVersion, userAgent.substring("Minecraft Java/".length()));
                 }
                 if (nonMinecraftClient) {
                     sendError(ctx, HttpResponseStatus.FORBIDDEN, "Invalid client");