diff --git a/common/xrdp_client_info.h b/common/xrdp_client_info.h
index d1ce1e1e..f003ee2a 100644
--- a/common/xrdp_client_info.h
+++ b/common/xrdp_client_info.h
@@ -110,6 +110,7 @@ struct xrdp_client_info
   int multimon; /* 0 = deny , 1 = allow */
   int monitorCount; /* number of monitors detected (max = 16) */
   struct monitor_info minfo[16]; /* client monitor data */
+  struct monitor_info minfo_wm[16]; /* client monitor data, non-negative values */
 
   int keyboard_type;
   int keyboard_subtype;
diff --git a/libxrdp/xrdp_sec.c b/libxrdp/xrdp_sec.c
index 3857e2d1..3e9cef66 100644
--- a/libxrdp/xrdp_sec.c
+++ b/libxrdp/xrdp_sec.c
@@ -1873,15 +1873,16 @@ xrdp_sec_process_mcs_data_monitors(struct xrdp_sec *self, struct stream *s)
     int y1;
     int x2;
     int y2;
+    int got_primary;
     struct xrdp_client_info *client_info = (struct xrdp_client_info *)NULL;
 
     client_info = &(self->rdp_layer->client_info);
 
-    DEBUG(("processing monitors data, allow_multimon is %d", client_info->multimon));
+    LLOGLN(10, ("xrdp_sec_process_mcs_data_monitors: processing monitors data, allow_multimon is %d", client_info->multimon));
     /* this is an option set in xrdp.ini */
     if (client_info->multimon != 1) /* are multi-monitors allowed ? */
     {
-        DEBUG(("[INFO] xrdp_sec_process_mcs_data_monitors: multimon is not "
+        LLOGLN(0, ("[INFO] xrdp_sec_process_mcs_data_monitors: multimon is not "
                "allowed, skipping"));
         return 0;
     }
@@ -1889,7 +1890,7 @@ xrdp_sec_process_mcs_data_monitors(struct xrdp_sec *self, struct stream *s)
     //verify flags - must be 0x0
     if (flags != 0)
     {
-        DEBUG(("[ERROR] xrdp_sec_process_mcs_data_monitors: flags MUST be "
+        LLOGLN(0, ("[ERROR] xrdp_sec_process_mcs_data_monitors: flags MUST be "
                "zero, detected: %d", flags));
         return 1;
     }
@@ -1897,12 +1898,12 @@ xrdp_sec_process_mcs_data_monitors(struct xrdp_sec *self, struct stream *s)
     //verify monitorCount - max 16
     if (monitorCount > 16)
     {
-        DEBUG(("[ERROR] xrdp_sec_process_mcs_data_monitors: max allowed "
+        LLOGLN(0, ("[ERROR] xrdp_sec_process_mcs_data_monitors: max allowed "
                "monitors is 16, detected: %d", monitorCount));
         return 1;
     }
 
-    g_writeln("monitorCount= %d", monitorCount); // for debugging only
+    LLOGLN(10, ("xrdp_sec_process_mcs_data_monitors: monitorCount= %d", monitorCount));
 
     client_info->monitorCount = monitorCount;
 
@@ -1910,6 +1911,7 @@ xrdp_sec_process_mcs_data_monitors(struct xrdp_sec *self, struct stream *s)
     y1 = 0;
     x2 = 0;
     y2 = 0;
+    got_primary = 0;
     /* Add client_monitor_data to client_info struct, will later pass to X11rdp */
     for (index = 0; index < monitorCount; index++)
     {
@@ -1933,16 +1935,51 @@ xrdp_sec_process_mcs_data_monitors(struct xrdp_sec *self, struct stream *s)
             y2 = MAX(y2, client_info->minfo[index].bottom);
         }
 
-        g_writeln("got a monitor: left= %d, top= %d, right= %d, bottom= %d, is_primary?= %d", client_info->minfo[index].left,
-            client_info->minfo[index].top, client_info->minfo[index].right, client_info->minfo[index].bottom, client_info->minfo[index].is_primary);
+        if (client_info->minfo[index].is_primary)
+        {
+            got_primary = 1;
+        }
+
+        LLOGLN(10, ("xrdp_sec_process_mcs_data_monitors: got a monitor [%d]: left= %d, top= %d, right= %d, bottom= %d, is_primary?= %d",
+                index,
+                client_info->minfo[index].left,
+                client_info->minfo[index].top,
+                client_info->minfo[index].right,
+                client_info->minfo[index].bottom,
+                client_info->minfo[index].is_primary));
     }
 
+    if (!got_primary)
+    {
+        /* no primary monitor was set, choose the leftmost monitor as primary */
+        for (index = 0; index < monitorCount; index++)
+        {
+            if (client_info->minfo[index].left == x1 &&
+                    client_info->minfo[index].top == y1)
+            {
+                client_info->minfo[index].is_primary = 1;
+                break;
+            }
+        }
+    }
+
+    /* set wm geometry */
     if ((x2 > x1) && (y2 > y1))
     {
         client_info->width = (x2 - x1) + 1;
         client_info->height = (y2 - y1) + 1;
     }
 
+    /* keep a copy of non negative monitor info values for xrdp_wm usage */
+    for (index = 0; index < monitorCount; index++)
+    {
+        client_info->minfo_wm[index].left =  client_info->minfo[index].left - x1;
+        client_info->minfo_wm[index].top =  client_info->minfo[index].top - y1;
+        client_info->minfo_wm[index].right =  client_info->minfo[index].right - x1;
+        client_info->minfo_wm[index].bottom =  client_info->minfo[index].bottom - y1;
+        client_info->minfo_wm[index].is_primary =  client_info->minfo[index].is_primary;
+    }
+
     return 0;
 }
 
diff --git a/xrdp/xrdp_login_wnd.c b/xrdp/xrdp_login_wnd.c
index 337ec236..c9fca912 100644
--- a/xrdp/xrdp_login_wnd.c
+++ b/xrdp/xrdp_login_wnd.c
@@ -618,14 +618,18 @@ xrdp_login_wnd_create(struct xrdp_wm *self)
     int log_width;
     int log_height;
     int regular;
-    int i = 0;
-    int primaryxoffset = 0;
-    int primaryyoffset = 0;
+    int primary_x_offset;
+    int primary_y_offset;
+    int index;
+    int x;
+    int y;
+    int cx;
+    int cy;
 
     globals = &self->xrdp_config->cfg_globals;
 
-    primaryxoffset = self->screen->width / 2;
-    primaryyoffset = self->screen->height / 2;
+    primary_x_offset = self->screen->width / 2;
+    primary_y_offset = self->screen->height / 2;
 
     log_width = globals->ls_width;
     log_height = globals->ls_height;
@@ -648,12 +652,17 @@ xrdp_login_wnd_create(struct xrdp_wm *self)
     /* multimon scenario, draw login window on primary monitor */
     if (self->client_info->monitorCount > 1)
     {
-        for (i = 0; i < self->client_info->monitorCount; ++i)
+        for (index = 0; index < self->client_info->monitorCount; index++)
         {
-            if (self->client_info->minfo[i].is_primary)
+            if (self->client_info->minfo_wm[index].is_primary)
             {
-                primaryxoffset = self->screen->width - (self->client_info->minfo[i].right / 2) - 1;
-                primaryyoffset = self->screen->height - (self->client_info->minfo[i].bottom / 2) - 1;
+                x = self->client_info->minfo_wm[index].left;
+                y = self->client_info->minfo_wm[index].top;
+                cx = self->client_info->minfo_wm[index].right;
+                cy = self->client_info->minfo_wm[index].bottom;
+
+                primary_x_offset = x + ((cx  - x) / 2);
+                primary_y_offset = y + ((cy - y) / 2);
                 break;
             }
         }
@@ -667,11 +676,8 @@ xrdp_login_wnd_create(struct xrdp_wm *self)
     self->login_window->owner = self->screen;
     self->login_window->bg_color = globals->ls_bg_color;
 
-    self->login_window->left = primaryxoffset -
-            self->login_window->width / 2;
-
-    self->login_window->top = primaryyoffset -
-                              self->login_window->height / 2;
+    self->login_window->left = primary_x_offset - self->login_window->width / 2;
+    self->login_window->top = primary_y_offset - self->login_window->height / 2;
 
 
     self->login_window->notify = xrdp_wm_login_notify;
diff --git a/xrdp/xrdp_wm.c b/xrdp/xrdp_wm.c
index 8ce18bb6..3b223902 100644
--- a/xrdp/xrdp_wm.c
+++ b/xrdp/xrdp_wm.c
@@ -1884,9 +1884,9 @@ xrdp_wm_show_log(struct xrdp_wm *self)
     int h;
     int xoffset;
     int yoffset;
-    int i;
-    int primaryxoffset = 0;
-    int primaryyoffset = 0;
+    int index;
+    int primary_x_offset;
+    int primary_y_offset;
 
 
     if (self->hide_log_window)
@@ -1916,15 +1916,18 @@ xrdp_wm_show_log(struct xrdp_wm *self)
             yoffset = 2;
         }
 
+        primary_x_offset = 0;
+        primary_y_offset = 0;
+
         /* multimon scenario, draw log window on primary monitor */
         if (self->client_info->monitorCount > 1)
         {
-            for (i = 0; i < self->client_info->monitorCount; ++i)
+            for (index = 0; index < self->client_info->monitorCount; index++)
             {
-                if (self->client_info->minfo[i].is_primary)
+                if (self->client_info->minfo_wm[index].is_primary)
                 {
-                    primaryxoffset = self->screen->width - self->client_info->minfo[i].right - 1;
-                    primaryyoffset = self->screen->height - self->client_info->minfo[i].bottom - 1;
+                    primary_x_offset = self->client_info->minfo_wm[index].left;
+                    primary_y_offset = self->client_info->minfo_wm[index].top;
                     break;
                 }
             }
@@ -1937,8 +1940,8 @@ xrdp_wm_show_log(struct xrdp_wm *self)
         self->log_wnd->parent = self->screen;
         self->log_wnd->owner = self->screen;
         self->log_wnd->bg_color = self->grey;
-        self->log_wnd->left = primaryxoffset + xoffset;
-        self->log_wnd->top = primaryyoffset + yoffset;
+        self->log_wnd->left = primary_x_offset + xoffset;
+        self->log_wnd->top = primary_y_offset + yoffset;
         set_string(&(self->log_wnd->caption1), "Connection Log");
         /* ok button */
         but = xrdp_bitmap_create(DEFAULT_BUTTON_W, DEFAULT_BUTTON_H, self->screen->bpp, WND_TYPE_BUTTON, self);