diff --git a/ibis-server/app/model/__init__.py b/ibis-server/app/model/__init__.py
index 24e93282a..cc80b5a35 100644
--- a/ibis-server/app/model/__init__.py
+++ b/ibis-server/app/model/__init__.py
@@ -82,7 +82,7 @@ class ClickHouseConnectionInfo(BaseModel):
     port: SecretStr
     database: SecretStr
     user: SecretStr
-    password: SecretStr
+    password: SecretStr | None = None
 
 
 class MSSqlConnectionInfo(BaseModel):
@@ -90,7 +90,7 @@ class MSSqlConnectionInfo(BaseModel):
     port: SecretStr
     database: SecretStr
     user: SecretStr
-    password: SecretStr
+    password: SecretStr | None = None
     driver: str = Field(default="ODBC Driver 18 for SQL Server")
     tds_version: str = Field(default="8.0", alias="TDS_Version")
     kwargs: dict[str, str] | None = Field(
@@ -103,7 +103,7 @@ class MySqlConnectionInfo(BaseModel):
     port: SecretStr
     database: SecretStr
     user: SecretStr
-    password: SecretStr
+    password: SecretStr | None = None
     ssl_mode: SecretStr | None = Field(alias="sslMode", default=None)
     ssl_ca: SecretStr | None = Field(alias="sslCA", default=None)
     kwargs: dict[str, str] | None = Field(
@@ -120,7 +120,7 @@ class PostgresConnectionInfo(BaseModel):
     port: SecretStr = Field(examples=[5432])
     database: SecretStr
     user: SecretStr
-    password: SecretStr
+    password: SecretStr | None = None
 
 
 class SnowflakeConnectionInfo(BaseModel):
diff --git a/ibis-server/app/model/data_source.py b/ibis-server/app/model/data_source.py
index d1aa3b41e..81cf34bad 100644
--- a/ibis-server/app/model/data_source.py
+++ b/ibis-server/app/model/data_source.py
@@ -118,7 +118,7 @@ def get_clickhouse_connection(info: ClickHouseConnectionInfo) -> BaseBackend:
             port=int(info.port.get_secret_value()),
             database=info.database.get_secret_value(),
             user=info.user.get_secret_value(),
-            password=info.password.get_secret_value(),
+            password=(info.password and info.password.get_secret_value()),
         )
 
     @classmethod
@@ -128,8 +128,11 @@ def get_mssql_connection(cls, info: MSSqlConnectionInfo) -> BaseBackend:
             port=info.port.get_secret_value(),
             database=info.database.get_secret_value(),
             user=info.user.get_secret_value(),
-            password=cls._escape_special_characters_for_odbc(
-                info.password.get_secret_value()
+            password=(
+                info.password
+                and cls._escape_special_characters_for_odbc(
+                    info.password.get_secret_value()
+                )
             ),
             driver=info.driver,
             TDS_Version=info.tds_version,
@@ -147,7 +150,7 @@ def get_mysql_connection(cls, info: MySqlConnectionInfo) -> BaseBackend:
             port=int(info.port.get_secret_value()),
             database=info.database.get_secret_value(),
             user=info.user.get_secret_value(),
-            password=info.password.get_secret_value(),
+            password=(info.password and info.password.get_secret_value()),
             **kwargs,
         )
 
@@ -158,7 +161,7 @@ def get_postgres_connection(info: PostgresConnectionInfo) -> BaseBackend:
             port=int(info.port.get_secret_value()),
             database=info.database.get_secret_value(),
             user=info.user.get_secret_value(),
-            password=info.password.get_secret_value(),
+            password=(info.password and info.password.get_secret_value()),
         )
 
     @staticmethod
@@ -189,7 +192,9 @@ def _escape_special_characters_for_odbc(value: str) -> str:
     @staticmethod
     def _create_ssl_context(info: ConnectionInfo) -> Optional[ssl.SSLContext]:
         ssl_mode = (
-            info.ssl_mode.get_secret_value() if hasattr(info, "ssl_mode") else None
+            info.ssl_mode.get_secret_value()
+            if hasattr(info, "ssl_mode") and info.ssl_mode
+            else None
         )
 
         if ssl_mode == SSLMode.VERIFY_CA and not info.ssl_ca: