-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 10.07.2015 20:17, wujot/Adalbert wrote:

But unencrypted session on path between Stunnel server and hi-speed end server (both in LAN) is using TcpWindowSize on level 64KB - 131KB

Did you consider also tuning SO_SNDBUF of the sending application?

(in Windows 2008 or newer it is calculated automatically). So I steel have at least 64KB buffer in stunnel.

IMHO Windows is probably not the best server platform...

Is there any possibility to force stunnel to use on faster part of connection (LAN side) the value of TcpWindowSize similar to calculated on slower part (on WAN side)?

I don't think such tricks are possible with BSD sockets. BTW: You can also change BUFFSIZE in common.h and rebuild stunnel. Best regards, Mike -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJVoDm6AAoJEC78f/DUFuAURJQQAM1ix6ZkSqOCa9iLiBDIFvrS DajgeGDGeSE75WkyI+IQrPYjWJGNielOeXhCPjYdQh+5o/bddYPaRlQRsu0HlY6F Nncj1kP8Xy0WNO4uxz1YWpnnJtE/Ph9VUVLqS/63tJgkrhmvXF1HODeu677JLzEb wjOn0kv6SmPnzkFMpjbBmkRPt5GeSRc43POGoHcuqFKijeaTDGoqhBLo+tGLhtNV ezYN+QFvyyzMVPe8tscWa+vyXYdbMzgLBXXCHFMbFmlpu6QKHKb0823Q7g7OgMCb DYkVbw0a0ys6hdreBHejvAbgfG8fTKOtYfdOa7lnjCuivGpVKLa018yTk/1qjUbs dmr08MFPGkkMSfV/sQ+PMgZ0Dxaoczt1yXanzURNDXC4eiUlgEXfs4S5J2NYxTOe g4ZG7ZXQIHrux1AcQD9TQF+G9h7YxXeRMt0K29qA54dH+x+Xie920OJMXohMAZJ0 ddkblmt7SHO2XiEV6C2ie1VvB/roZ+aeqKQME4T8oZliy/kaDgXgs/eFLT2Kxw9B WwlWt4r4pLHFkJfExJF/nMWe0qRt/tlVoqyvOFE1hnTxOGr5pGLnY0XOoHX13kr/ ow1TC0N0UPWV++Uydm2oJwXA+o7a/TRs8O+PEhhHTqLDi4O/apC7kL9fM6DjESGr Zj+br1nUiaF+LscAiC/D =kA2M -----END PGP SIGNATURE-----