diff --git a/app/db/crud.py b/app/db/crud.py
index 7d3ac56..5fecd18 100644
--- a/app/db/crud.py
+++ b/app/db/crud.py
@@ -162,7 +162,7 @@ def add_host(db: Session, inbound: Inbound, host: InboundHostModify):
         host=host.host,
         inbound=inbound,
         security=host.security,
-        alpn=host.alpn,
+        alpn=host.alpn.value,
         fingerprint=host.fingerprint,
         fragment=host.fragment.model_dump() if host.fragment else None,
         mux=host.mux,
@@ -181,7 +181,7 @@ def update_host(db: Session, db_host: InboundHost, host: InboundHostModify):
     db_host.sni = host.sni
     db_host.host = host.host
     db_host.security = host.security
-    db_host.alpn = host.alpn
+    db_host.alpn = host.alpn.value
     db_host.fingerprint = host.fingerprint
     db_host.fragment = host.fragment.model_dump() if host.fragment else None
     db_host.mux = host.mux
diff --git a/app/db/migrations/versions/5410d8ec78ff_alpn_to_string.py b/app/db/migrations/versions/5410d8ec78ff_alpn_to_string.py
new file mode 100644
index 0000000..b2da188
--- /dev/null
+++ b/app/db/migrations/versions/5410d8ec78ff_alpn_to_string.py
@@ -0,0 +1,70 @@
+"""make host alpn string
+
+Revision ID: 5410d8ec78ff
+Revises: b0357faf51c8
+Create Date: 2024-07-24 22:47:51.528849
+
+"""
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql, mysql
+
+# revision identifiers, used by Alembic.
+revision = "5410d8ec78ff"
+down_revision = "b0357faf51c8"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    if (dialect := op.get_bind().dialect.name) == "postgresql":
+        op.alter_column(
+            "hosts",
+            "alpn",
+            existing_type=postgresql.ENUM(
+                "none", "h2", "http/1.1", "h2,http/1.1", name="proxyhostalpn"
+            ),
+            type_=sa.String(length=32),
+            existing_nullable=False,
+            nullable=True,
+            server_default=None,
+        )
+    elif dialect == "mysql" or dialect == "mariadb":
+        op.alter_column(
+            "hosts",
+            "alpn",
+            existing_type=mysql.ENUM("none", "h2", "http/1.1", "h2,http/1.1"),
+            type_=sa.String(length=32),
+            nullable=True,
+        )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    if (dialect := op.get_bind().dialect.name) == "postgresql":
+        op.alter_column(
+            "hosts",
+            "alpn",
+            existing_type=sa.String(length=32),
+            type_=postgresql.ENUM(
+                "none", "h2", "http/1.1", "h2,http/1.1", name="proxyhostalpn"
+            ),
+            existing_nullable=True,
+            nullable=False,
+            existing_server_default=None,
+            server_default=sa.text("'none'::proxyhostalpn"),
+        )
+    elif dialect == "mysql" or dialect == "mariadb":
+        op.alter_column(
+            "hosts",
+            "alpn",
+            existing_type=sa.String(length=32),
+            type_=mysql.ENUM("none", "h2", "http/1.1", "h2,http/1.1"),
+            nullable=False,
+            existing_server_default=None,
+            server_default=sa.text("'none'"),
+        )
+    # ### end Alembic commands ###
diff --git a/app/db/models.py b/app/db/models.py
index 2b05227..d0058de 100644
--- a/app/db/models.py
+++ b/app/db/models.py
@@ -28,7 +28,6 @@ from app.config.env import SUBSCRIPTION_URL_PREFIX
 from app.db.base import Base
 from app.models.node import NodeStatus
 from app.models.proxy import (
-    InboundHostALPN,
     InboundHostFingerprint,
     InboundHostSecurity,
     ProxyTypes,
@@ -315,10 +314,8 @@ class InboundHost(Base):
         default=InboundHostSecurity.inbound_default,
     )
     alpn = Column(
-        Enum(InboundHostALPN),
-        nullable=False,
-        default=InboundHostSecurity.none,
-        server_default=InboundHostSecurity.none.name,
+        String(32),
+        server_default=sqlalchemy.sql.null(),
     )
     fingerprint = Column(
         Enum(InboundHostFingerprint),
diff --git a/app/models/proxy.py b/app/models/proxy.py
index b201d5d..f954cb6 100644
--- a/app/models/proxy.py
+++ b/app/models/proxy.py
@@ -22,7 +22,7 @@ class InboundHostSecurity(str, Enum):
 InboundHostALPN = Enum(
     "ProxyHostALPN",
     {
-        "none": "",
+        "none": "none",
         "h2": "h2",
         "http/1.1": "http/1.1",
         "h2,http/1.1": "h2,http/1.1",
@@ -88,6 +88,13 @@ class InboundHost(BaseModel):
 
         return v
 
+    @field_validator("alpn", mode="before")
+    @classmethod
+    def validate_alpn(cls, v):
+        if not v:
+            return InboundHostALPN.none
+        return v
+
 
 class InboundHostResponse(InboundHost):
     id: int
diff --git a/app/utils/share.py b/app/utils/share.py
index 91d28d6..8e94275 100644
--- a/app/utils/share.py
+++ b/app/utils/share.py
@@ -63,7 +63,6 @@ handlers_templates = {
 def generate_subscription_template(
     db_user, subscription_settings: SubscriptionSettings
 ):
-    print(subscription_settings.shuffle_configs)
     links = generate_subscription(
         user=db_user,
         config_format="links",
@@ -266,7 +265,7 @@ def generate_user_configs(
                 host=req_host,
                 tls=host_tls or inbound["tls"],
                 header_type=inbound.get("header_type"),
-                alpn=host.alpn.value or None,
+                alpn=host.alpn if host.alpn != "none" else None,
                 path=(
                     host.path.format_map(format_variables)
                     if host.path