Sometimes VNC server hangs

One of our customers has two PC's with SuSE 10.0, running 2 VNC servers
(Realvnc 4.1.1) each. From time to time session 1 of one machine hangs.
VNC viewer shows "connected" (netstat -an shows it, too), but no
password question appears.

Today we have this status. netstat -an shows still a connection to
another PC. My try to connect showed status CLOSE-WAIT. What further can
be done to investigate the error?

Here is the log file with replaced IP addresses:

Xvnc Free Edition 4.1.1 - built Mar 11 2005 16:09:48
Copyright (C) 2002-2005 RealVNC Ltd.
See http://www.realvnc.com for information on VNC.
Underlying X server release 40201000, The XFree86 Project, Inc


Thu Mar 9 14:56:44 2006
vncext: VNC extension running!
vncext: Listening for VNC connections on port 5901
vncext: Listening for HTTP connections on port 5801
vncext: created VNC server for screen 0
Could not init font path element /usr/X11R6/lib/X11/fonts/Speedo/,
removing from list!
xrdb: No such file or directory
xrdb: can't open file '/home/lzgneu/.Xresources'

Fri Mar 10 07:56:50 2006
Connections: accepted: x.x.x.213::1139
SConnection: Client needs protocol version 3.8
SConnection: Client requests security type VncAuth(2)
VNCSConnST: Server default pixel format depth 8 (8bpp) colour-map
VNCSConnST: Client pixel format depth 8 (8bpp) colour-map

Fri Mar 10 09:05:24 2006
Connections: closed: x.x.x.213::1139 (Clean disconnection)
SMsgWriter: framebuffer updates 4836
SMsgWriter: hextile rects 6074, bytes 622638
SMsgWriter: ZRLE rects 2, bytes 14048
SMsgWriter: raw bytes equivalent 7412680, compression ratio
11.642599

Fri Mar 10 09:24:35 2006
Connections: accepted: x.x.y.21::54542
SConnection: Client needs protocol version 3.8

Fri Mar 10 09:24:36 2006
SConnection: Client requests security type VncAuth(2)

Fri Mar 10 09:24:38 2006
VNCSConnST: Server default pixel format depth 8 (8bpp) colour-map

Fri Mar 10 09:24:39 2006
VNCSConnST: Client pixel format depth 8 (8bpp) colour-map

Fri Mar 10 09:24:44 2006
Connections: closed: x.x.y.21::54542 (Clean disconnection)
SMsgWriter: framebuffer updates 2
SMsgWriter: ZRLE rects 4, bytes 31080
SMsgWriter: raw bytes equivalent 1311696, compression ratio
42.203861

Sun Mar 12 12:34:15 2006
Connections: accepted: x.x.x.12::1141
SConnection: Client needs protocol version 3.4
SConnection: Client uses unofficial protocol version 3.4
SConnection: Assuming compatibility with version 3.3

Sun Mar 12 12:34:19 2006
VNCSConnST: Server default pixel format depth 8 (8bpp) colour-map

Sun Mar 12 12:34:20 2006
VNCSConnST: Client pixel format depth 8 (8bpp) bgr233
VNCSConnST: Client pixel format depth 16 (16bpp) little-endian bgr556

Sun Mar 12 12:34:41 2006
Connections: closed: x.x.x.12::1141 (Clean disconnection)
SMsgWriter: framebuffer updates 67
SMsgWriter: hextile rects 132, bytes 4314921
SMsgWriter: ZRLE rects 2, bytes 31006
SMsgWriter: raw bytes equivalent 153553640, compression ratio
35.332770

Mon Mar 13 08:32:46 2006
Connections: accepted: x.x.x.213::1277

Mon Mar 13 08:32:47 2006
SConnection: Client needs protocol version 3.8
SConnection: Client requests security type VncAuth(2)
VNCSConnST: Server default pixel format depth 8 (8bpp) colour-map
VNCSConnST: Client pixel format depth 8 (8bpp) colour-map

The connection to x.x.x.213 appears still in the output from netstat
-an.

Regards,
--
Burkhard Schultheis
Tele Data Electronic, Wagnerstr. 10, D-76448 Durmersheim
Email: (E-Mail Removed)
Phone: +49 7245 9287-21