diff --git a/smb/CMakeLists.txt b/smb/CMakeLists.txt
--- a/smb/CMakeLists.txt
+++ b/smb/CMakeLists.txt
@@ -6,6 +6,9 @@
 include(CheckIncludeFile)
 set(CMAKE_AUTOMAKE ON)
 
+# exists in Samba >= 4.10 (since commit 0dae4e2f5c65)
+CHECK_FUNCTION_EXISTS(smbc_setOptionProtocols HAVE_SMBC_SETOPTIONPROTOCOLS)
+
 if(NOT WIN32)
 check_include_file(utime.h HAVE_UTIME_H)
 
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 = nullptr;
+		qCDebug(KIO_SMB) << "Setting client max protocol = NT1 for browsing SMB network";
+		smbc_option_set(smb_context, "NT1", "NT1");
+#endif
         return kurl; //unchanged
     }