diff --git a/apps/desktop/src/components/connection/ConnectionDialog.vue b/apps/desktop/src/components/connection/ConnectionDialog.vue
index c1d8e660e..6042e1050 100644
--- a/apps/desktop/src/components/connection/ConnectionDialog.vue
+++ b/apps/desktop/src/components/connection/ConnectionDialog.vue
@@ -135,6 +135,7 @@ const defaultForm = (): ConnectionForm => ({
   redis_key_separator: ":",
   etcd_endpoints: "",
   gbase_server: "",
+  informix_server: "",
   external_config: undefined,
   read_only: false,
   visible_databases: undefined,
@@ -736,6 +737,7 @@ watch(
         redis_cluster_nodes: config.redis_cluster_nodes || "",
         redis_key_separator: config.redis_key_separator ?? ":",
         etcd_endpoints: config.etcd_endpoints || "",
+        informix_server: config.informix_server || "",
         read_only: config.read_only || false,
         visible_databases: config.visible_databases,
       };
@@ -1255,6 +1257,13 @@ function connectionConfigForSubmit(id: string): ConnectionConfig {
   if (config.db_type === "manticoresearch") {
     config.url_params = "";
   }
+  if (config.db_type === "informix" && config.informix_server) {
+    // Strip INFORMIXSERVER from url_params to avoid duplicate when dedicated field is used
+    config.url_params = (config.url_params || "")
+      .replace(/(?:^|[;])\s*INFORMIXSERVER\s*=[^;]*/gi, "")
+      .replace(/^[;]|[;]$/g, "")
+      .trim();
+  }
   if (!config.one_time) config.one_time = undefined;
   if (!config.read_only) config.read_only = undefined;
   if (config.db_type === "mq") {
@@ -2973,6 +2982,11 @@ function openExternalUrl(url: string) {
                     <Input v-model="form.gbase_server" class="col-span-3" placeholder="gbase01" />
                   </div>
 
+                  <div v-if="form.db_type === 'informix'" class="grid grid-cols-4 items-center gap-4">
+                    <Label class="text-right text-xs">{{ t("connection.informixServer") }}</Label>
+                    <Input v-model="form.informix_server" class="col-span-3" placeholder="ol_informix1170" />
+                  </div>
+
                   <div class="grid grid-cols-4 items-center gap-4">
                     <Label class="text-right">{{ t("connection.user") }}</Label>
                     <Input v-model="form.username" class="col-span-3" />
@@ -3043,7 +3057,7 @@ function openExternalUrl(url: string) {
                               : form.db_type === 'bigquery'
                                 ? 'OAuthType=0;OAuthServiceAcctEmail=svc@project.iam.gserviceaccount.com;OAuthPvtKeyPath=/path/key.json'
                                 : form.db_type === 'informix'
-                                  ? 'INFORMIXSERVER=informix;CLIENT_LOCALE=en_US.utf8;DB_LOCALE=en_US.utf8'
+                                  ? 'CLIENT_LOCALE=en_US.utf8;DB_LOCALE=en_US.utf8'
                                   : 'sslmode=disable'
                       "
                     />
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 5c95a0fe2..65867818d 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -172,6 +172,7 @@ export default {
     driverNamePlaceholder: "Vendor or environment name",
     urlParams: "URL Params",
     gbaseServer: "GBASEDBTSERVER",
+    informixServer: "INFORMIXSERVER",
     sslEnable: "Enable encrypted connection",
     caCertPath: "CA Certificate",
     caCertPathPlaceholder: "Optional, e.g. ~/.yandex/RootCA.crt",
diff --git a/apps/desktop/src/i18n/locales/ja.ts b/apps/desktop/src/i18n/locales/ja.ts
index 4a16cd6a5..9afbe8868 100644
--- a/apps/desktop/src/i18n/locales/ja.ts
+++ b/apps/desktop/src/i18n/locales/ja.ts
@@ -171,6 +171,7 @@ export default {
     driverNamePlaceholder: "ベンダー名または環境名",
     urlParams: "URLパラメータ",
     gbaseServer: "GBASEDBTSERVER",
+    informixServer: "INFORMIXSERVER",
     sslEnable: "暗号化接続を有効にする",
     caCertPath: "CA証明書",
     caCertPathPlaceholder: "任意、例: ~/.yandex/RootCA.crt",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index a2ba6a994..84f023cf9 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -173,6 +173,7 @@ export default {
     driverNamePlaceholder: "厂商或环境名称",
     urlParams: "URL 参数",
     gbaseServer: "GBASEDBTSERVER",
+    informixServer: "INFORMIXSERVER",
     sslEnable: "启用加密连接",
     caCertPath: "CA 证书",
     caCertPathPlaceholder: "可选，例如 ~/.yandex/RootCA.crt",
diff --git a/apps/desktop/src/types/database.ts b/apps/desktop/src/types/database.ts
index fcf7f6c6b..42e51d656 100644
--- a/apps/desktop/src/types/database.ts
+++ b/apps/desktop/src/types/database.ts
@@ -101,6 +101,7 @@ export interface ConnectionConfig {
   redis_key_separator?: string;
   etcd_endpoints?: string;
   gbase_server?: string;
+  informix_server?: string;
   external_config?: unknown;
   one_time?: boolean;
   read_only?: boolean;
diff --git a/crates/dbx-core/src/agent_connection.rs b/crates/dbx-core/src/agent_connection.rs
index 57fd56000..5207f8966 100644
--- a/crates/dbx-core/src/agent_connection.rs
+++ b/crates/dbx-core/src/agent_connection.rs
@@ -49,6 +49,7 @@ pub fn agent_connect_params(config: &ConnectionConfig, host: &str, port: u16, da
         "client_key_path": config.client_key_path,
         "etcd_endpoints": etcd_endpoints,
         "gbase_server": config.gbase_server,
+        "informix_server": config.informix_server,
         "jdbc_driver_class": config.jdbc_driver_class.as_deref().unwrap_or(""),
         "jdbc_driver_paths": &config.jdbc_driver_paths,
     })
@@ -564,6 +565,7 @@ mod tests {
             redis_key_separator: default_redis_key_separator(),
             etcd_endpoints: String::new(),
             gbase_server: String::new(),
+            informix_server: String::new(),
             external_config: None,
             jdbc_driver_class: None,
             jdbc_driver_paths: Vec::new(),
diff --git a/crates/dbx-core/src/db/agent_driver.rs b/crates/dbx-core/src/db/agent_driver.rs
index 42603a864..bd6437dfc 100644
--- a/crates/dbx-core/src/db/agent_driver.rs
+++ b/crates/dbx-core/src/db/agent_driver.rs
@@ -808,7 +808,7 @@ fn agent_java_args(jar_path: &str) -> Vec<String> {
     .map(str::to_string)
     .collect::<Vec<_>>();
 
-    if agent_jar_path_matches_key(jar_path, "kingbase") {
+    if agent_jar_path_matches_key(jar_path, "kingbase") || agent_jar_path_matches_key(jar_path, "informix") {
         args.push("-Djava.net.preferIPv4Stack=true".to_string());
     }
 
@@ -981,6 +981,13 @@ mod tests {
         assert!(args.iter().any(|arg| arg == "-Djava.net.preferIPv4Stack=true"));
     }
 
+    #[test]
+    fn agent_java_args_prefer_ipv4_for_informix() {
+        let args = agent_java_args("/tmp/dbx/drivers/informix/agent.jar");
+
+        assert!(args.iter().any(|arg| arg == "-Djava.net.preferIPv4Stack=true"));
+    }
+
     #[test]
     fn agent_java_args_do_not_prefer_ipv4_for_other_agents() {
         let args = agent_java_args("/tmp/dbx/drivers/highgo/agent.jar");
diff --git a/crates/dbx-core/src/models/connection.rs b/crates/dbx-core/src/models/connection.rs
index d7bcfd0d8..04d0133a6 100644
--- a/crates/dbx-core/src/models/connection.rs
+++ b/crates/dbx-core/src/models/connection.rs
@@ -68,6 +68,10 @@ pub struct ConnectionConfig {
     pub etcd_endpoints: String,
     #[serde(default, skip_serializing_if = "String::is_empty")]
     pub gbase_server: String,
+    /// Informix server name (INFORMIXSERVER). When empty, the agent
+    /// derives it from the hostname.
+    #[serde(default, skip_serializing_if = "String::is_empty")]
+    pub informix_server: String,
     /// Typed configuration for external tabular sources.
     #[serde(default)]
     pub external_config: Option<serde_json::Value>,
@@ -374,6 +378,8 @@ struct ConnectionConfigData {
     #[serde(default)]
     pub gbase_server: String,
     #[serde(default)]
+    pub informix_server: String,
+    #[serde(default)]
     pub external_config: Option<serde_json::Value>,
     #[serde(default)]
     pub jdbc_driver_class: Option<String>,
@@ -424,6 +430,7 @@ impl From<ConnectionConfigData> for ConnectionConfig {
             redis_key_separator: data.redis_key_separator,
             etcd_endpoints: data.etcd_endpoints,
             gbase_server: data.gbase_server,
+            informix_server: data.informix_server,
             external_config: data.external_config,
             jdbc_driver_class: data.jdbc_driver_class,
             jdbc_driver_paths: data.jdbc_driver_paths,
@@ -1463,6 +1470,7 @@ mod tests {
             redis_key_separator: default_redis_key_separator(),
             etcd_endpoints: String::new(),
             gbase_server: String::new(),
+            informix_server: String::new(),
             external_config: None,
             jdbc_driver_class: None,
             jdbc_driver_paths: Vec::new(),