diff --git a/cmake/FindSamba.cmake b/cmake/FindSamba.cmake
--- a/cmake/FindSamba.cmake
+++ b/cmake/FindSamba.cmake
@@ -36,6 +36,8 @@
    set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${SAMBA_INCLUDE_DIR})
    check_symbol_exists(smbc_set_context "libsmbclient.h" SAMBA_HAVE_SMBC_SET_CONTEXT)
    check_symbol_exists(smbc_option_set "libsmbclient.h" SAMBA_HAVE_SMBC_OPTION_SET)
+   # exists in Samba >= 4.10 (since commit 0dae4e2f5c65)
+   check_symbol_exists(smbc_setOptionProtocols "libsmbclient.h" SAMBA_HAVE_SMBC_SETOPTIONPROTOCOLS)
    cmake_pop_check_state()
    # fail if smbc_set_context() was required but hasn't been found
    if (SAMBA_REQUIRE_SMBC_SET_CONTEXT AND NOT SAMBA_HAVE_SMBC_SET_CONTEXT)
@@ -45,6 +47,9 @@
    if (SAMBA_REQUIRE_SMBC_OPTION_SET AND NOT SAMBA_HAVE_SMBC_OPTION_SET)
       set(SAMBA_FOUND FALSE)
    endif (SAMBA_REQUIRE_SMBC_OPTION_SET AND NOT SAMBA_HAVE_SMBC_OPTION_SET)
+   if (SAMBA_HAVE_SMBC_SETOPTIONPROTOCOLS)
+      add_definitions(-DHAVE_SMBC_SETOPTIONPROTOCOLS)
+   endif (SAMBA_HAVE_SMBC_SETOPTIONPROTOCOLS)
 else(SAMBA_INCLUDE_DIR AND SAMBA_LIBRARIES)
    set(SAMBA_FOUND FALSE)
    set(SAMBA_HAVE_SMBC_SET_CONTEXT FALSE)
diff --git a/smb/kio_smb_browse.cpp b/smb/kio_smb_browse.cpp
--- a/smb/kio_smb_browse.cpp
+++ b/smb/kio_smb_browse.cpp
@@ -195,6 +195,16 @@
         }
     }
     if (surl == QLatin1String("smb://")) {
+#ifdef HAVE_SMBC_SETOPTIONPROTOCOLS
+		// Samba 4.8 changed default 'client max protocol' from NT1 to SMB3,
+		// together with fixes of Badlock, it broke browsing smb:// with
+		// default settings, because only NT1 (SMB1) protocol can browse network.
+		// Samba 4.10 made it possible to set min/max protocol version
+		// via libsmbclient API.
+		SMBCCTX *smb_context = smbc_set_context(nullptr);
+		qCDebug(KIO_SMB) << "Setting client max protocol = NT1 for browsing SMB network";
+		smbc_setOptionProtocols(smb_context, "NT1", "NT1");
+#endif
         return kurl; //unchanged
     }