diff --git a/client/core/errorstrings.cpp b/client/core/errorstrings.cpp
index 23e4e36e..f571c91a 100644
--- a/client/core/errorstrings.cpp
+++ b/client/core/errorstrings.cpp
@@ -39,6 +39,8 @@ QString errorString(ErrorCode code){
 
     // Distro errors
     case (OpenVpnExecutableMissing): return QObject::tr("OpenVPN executable missing");
+    case (ShadowSocksExecutableMissing): return QObject::tr("ShadowSocks (ss-local) executable missing");
+    case (CloakExecutableMissing): return QObject::tr("Cloak (ck-client) executable missing");
     case (AmneziaServiceConnectionFailed): return QObject::tr("Amnezia helper service error");
     case (OpenSslFailed): return QObject::tr("OpenSSL failed");
 
diff --git a/client/protocols/openvpnovercloakprotocol.cpp b/client/protocols/openvpnovercloakprotocol.cpp
index 01afb4ca..2e9d77e8 100644
--- a/client/protocols/openvpnovercloakprotocol.cpp
+++ b/client/protocols/openvpnovercloakprotocol.cpp
@@ -27,6 +27,10 @@ OpenVpnOverCloakProtocol::~OpenVpnOverCloakProtocol()
 
 ErrorCode OpenVpnOverCloakProtocol::start()
 {
+    if (!QFileInfo::exists(cloakExecPath())) {
+        setLastError(ErrorCode::CloakExecutableMissing);
+        return lastError();
+    }
 #ifndef Q_OS_IOS
     if (Utils::processIsRunning(Utils::executable("ck-client", false))) {
         Utils::killProcessByName(Utils::executable("ck-client", false));
@@ -106,6 +110,8 @@ QString OpenVpnOverCloakProtocol::cloakExecPath()
 {
 #ifdef Q_OS_WIN
     return Utils::executable(QString("cloak/ck-client"), true);
+#elif defined Q_OS_LINUX
+        return Utils::usrExecutable("ck-client");
 #else
     return Utils::executable(QString("/ck-client"), true);
 #endif
diff --git a/client/protocols/shadowsocksvpnprotocol.cpp b/client/protocols/shadowsocksvpnprotocol.cpp
index e2465c1f..bc494777 100644
--- a/client/protocols/shadowsocksvpnprotocol.cpp
+++ b/client/protocols/shadowsocksvpnprotocol.cpp
@@ -27,6 +27,13 @@ ShadowSocksVpnProtocol::~ShadowSocksVpnProtocol()
 
 ErrorCode ShadowSocksVpnProtocol::start()
 {
+
+    if (!QFileInfo::exists(shadowSocksExecPath())) {
+        setLastError(ErrorCode::ShadowSocksExecutableMissing);
+        return lastError();
+    }
+
+
 #ifndef Q_OS_IOS
     if (Utils::processIsRunning(Utils::executable("ss-local", false))) {
         Utils::killProcessByName(Utils::executable("ss-local", false));