diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 6d3f6987..04a6267f 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -620,6 +620,20 @@ class SSH2
      */
     protected $window_size = 0x7FFFFFFF;
 
+    /**
+     * What we resize the window to
+     *
+     * When PuTTY resizes the window it doesn't add an additional 0x7FFFFFFF bytes - it adds 0x40000000 bytes.
+     * Some SFTP clients (GoAnywhere) don't support adding 0x7FFFFFFF to the window size after the fact so
+     * we'll just do what PuTTY does
+     *
+     * @var int
+     * @see self::_send_channel_packet()
+     * @see self::exec()
+     * @access private
+     */
+    var $window_resize = 0x40000000;
+
     /**
      * Window size, server to client
      *
@@ -3616,9 +3630,11 @@ class SSH2
 
                 // resize the window, if appropriate
                 if ($this->window_size_server_to_client[$channel] < 0) {
-                    $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$channel], $this->window_size);
+                // PuTTY does something more analogous to the following:
+                //if ($this->window_size_server_to_client[$channel] < 0x3FFFFFFF) {
+                    $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$channel], $this->window_resize);
                     $this->send_binary_packet($packet);
-                    $this->window_size_server_to_client[$channel]+= $this->window_size;
+                    $this->window_size_server_to_client[$channel]+= $this->window_resize;
                 }
 
                 switch ($type) {