diff --git a/server/app/core/sshManager.js b/server/app/core/sshManager.js
index 79a956952..e848956b1 100644
--- a/server/app/core/sshManager.js
+++ b/server/app/core/sshManager.js
@@ -247,5 +247,6 @@ module.exports = {
   getSshHostinfo,
   removeSsh,
   askPassword,
-  createSsh
+  createSsh,
+  isVerboseSshEnabled
 };
diff --git a/server/app/db/version.json b/server/app/db/version.json
index a9ad41afd..e44604107 100644
--- a/server/app/db/version.json
+++ b/server/app/db/version.json
@@ -1 +1 @@
-{"version": "2026-0605-211714" }
\ No newline at end of file
+{"version": "2026-0605-221627" }
\ No newline at end of file
diff --git a/server/app/handlers/tryToConnect.js b/server/app/handlers/tryToConnect.js
index bc62636f5..229c24255 100644
--- a/server/app/handlers/tryToConnect.js
+++ b/server/app/handlers/tryToConnect.js
@@ -8,18 +8,19 @@ const SshClientWrapper = require("ssh-client-wrapper");
 const { getLogger } = require("../logSettings");
 const logger = getLogger();
 const { remoteHost } = require("../db/db");
-const { askPassword } = require("../core/sshManager.js");
+const { askPassword, isVerboseSshEnabled } = require("../core/sshManager.js");
 
 /**
  * try to connect remote host via ssh
  * @param {string} clientID - socketIO client's ID string
  * @param {object} hostInfo - target host's information
  * @param {Function} cb - call back function called with string "success" or "error"
+ * @returns {Promise<void>}
  */
 async function onTryToConnect(clientID, hostInfo, cb) {
   hostInfo.password = askPassword.bind(null, clientID, hostInfo.name, "password", null);
   hostInfo.passphrase = askPassword.bind(null, clientID, hostInfo.name, "passphrase", null);
-  if (process.env.WHEEL_VERBOSE_SSH) {
+  if (isVerboseSshEnabled()) {
     hostInfo.sshOpt = ["-vvv"];
   }
   const ssh = new SshClientWrapper(hostInfo);
@@ -38,6 +39,14 @@ async function onTryToConnect(clientID, hostInfo, cb) {
   ssh.disconnect();
   return cb("success");
 }
+
+/**
+ * try to connect remote host via ssh with host id
+ * @param {string} clientID - socketIO client's ID string
+ * @param {string} id - remote host id
+ * @param {Function} cb - call back function called with string "success" or "error"
+ * @returns {Promise<void>}
+ */
 async function onTryToConnectById(clientID, id, cb) {
   const hostInfo = remoteHost.get(id);
   await onTryToConnect(clientID, hostInfo, cb);
diff --git a/server/test/app/handlers/tryToConnect.js b/server/test/app/handlers/tryToConnect.js
new file mode 100644
index 000000000..7702b9bef
--- /dev/null
+++ b/server/test/app/handlers/tryToConnect.js
@@ -0,0 +1,108 @@
+"use strict";
+const os = require("os");
+const path = require("path");
+const fs = require("fs-extra");
+
+const chai = require("chai");
+const expect = chai.expect;
+const sinon = require("sinon");
+chai.use(require("sinon-chai"));
+const rewire = require("rewire");
+
+describe("tryToConnect UT", ()=>{
+  const originalHome = process.env.HOME;
+  const originalWheelUseHttp = process.env.WHEEL_USE_HTTP;
+  const originalWheelVerboseSsh = process.env.WHEEL_VERBOSE_SSH;
+  let tempHome;
+  let tryToConnect;
+  let onTryToConnect;
+  let SshClientWrapperMock;
+  let canConnectMock;
+  let disconnectMock;
+  let askPasswordMock;
+  let cb;
+
+  before(async ()=>{
+    tempHome = await fs.mkdtemp(path.join(os.tmpdir(), "wheel-try-connect-"));
+    process.env.HOME = tempHome;
+    process.env.WHEEL_USE_HTTP = "1";
+    await fs.ensureDir(path.join(tempHome, ".wheel"));
+    await Promise.all([
+      fs.writeJson(path.join(tempHome, ".wheel", "remotehost.json"), []),
+      fs.writeJson(path.join(tempHome, ".wheel", "projectList.json"), []),
+      fs.writeJson(path.join(tempHome, ".wheel", "jobScriptTemplate.json"), [])
+    ]);
+  });
+
+  beforeEach(()=>{
+    cb = sinon.stub();
+    canConnectMock = sinon.stub().resolves();
+    disconnectMock = sinon.stub();
+    askPasswordMock = sinon.stub();
+
+    tryToConnect = rewire("../../../app/handlers/tryToConnect.js");
+    SshClientWrapperMock = sinon.stub().callsFake((hostInfo)=>{
+      return {
+        hostInfo,
+        canConnect: canConnectMock,
+        disconnect: disconnectMock
+      };
+    });
+
+    tryToConnect.__set__({
+      SshClientWrapper: SshClientWrapperMock,
+      askPassword: askPasswordMock,
+      logger: {
+        debug: sinon.stub(),
+        info: sinon.stub(),
+        error: sinon.stub()
+      }
+    });
+    onTryToConnect = tryToConnect.__get__("onTryToConnect");
+  });
+
+  afterEach(()=>{
+    sinon.restore();
+    if (originalWheelVerboseSsh !== undefined) {
+      process.env.WHEEL_VERBOSE_SSH = originalWheelVerboseSsh;
+    } else {
+      delete process.env.WHEEL_VERBOSE_SSH;
+    }
+  });
+
+  after(async ()=>{
+    if (originalHome !== undefined) {
+      process.env.HOME = originalHome;
+    } else {
+      delete process.env.HOME;
+    }
+    if (originalWheelUseHttp !== undefined) {
+      process.env.WHEEL_USE_HTTP = originalWheelUseHttp;
+    } else {
+      delete process.env.WHEEL_USE_HTTP;
+    }
+    await fs.remove(tempHome);
+  });
+
+  it("should set sshOpt when WHEEL_VERBOSE_SSH is truthy", async ()=>{
+    process.env.WHEEL_VERBOSE_SSH = "true";
+    const hostInfo = { name: "testHost", host: "localhost", port: 22, user: "test" };
+
+    await onTryToConnect("client-1", hostInfo, cb);
+
+    expect(hostInfo.sshOpt).to.deep.equal(["-vvv"]);
+    expect(SshClientWrapperMock).to.have.been.calledOnceWithExactly(hostInfo);
+    expect(cb).to.have.been.calledOnceWithExactly("success");
+  });
+
+  it("should not set sshOpt when WHEEL_VERBOSE_SSH is false-like", async ()=>{
+    process.env.WHEEL_VERBOSE_SSH = "false";
+    const hostInfo = { name: "testHost", host: "localhost", port: 22, user: "test" };
+
+    await onTryToConnect("client-1", hostInfo, cb);
+
+    expect(hostInfo).to.not.have.property("sshOpt");
+    expect(SshClientWrapperMock).to.have.been.calledOnceWithExactly(hostInfo);
+    expect(cb).to.have.been.calledOnceWithExactly("success");
+  });
+});