We have two primary ZCM 11.3.2 servers (SLES 11 sp3 in VMWare) almost identically set up. Yesterday PXE clients connecting to one of them just wont run imaging. Client ends with "Contacting Novell Preboot Service ... Done" and quits no matter what. This is found in novell-zmgprebootpolicy.log (sorry about the length) when the pxe-menu is requested with ctrl + alt:

[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [Novell ZENworks Preboot Policy daemon 11.3.2] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [Novell ZENworks Preboot Policy Service] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [Copyright Novell, Inc. 2011-2014 All rights Reserved] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [Started] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [ Configuration file: /etc/opt/novell/zenworks/preboot/novell-zmgprebootpolicy.conf] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [ Using interface: 192.168.0.6] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [ AMT support: disabled] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [ Logging level: 3] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [ Logging file: /var/opt/novell/log/zenworks/preboot/novell-zmgprebootpolicy.log] [] [] [] [Imaging]
[DEBUG] [07/08/2015 13:59:09.000] [11886] [zmgtool] [11886] [] [zmgtool] [] [Sending default policy queries to 192.168.0.6] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11888] [] [zmgtool] [] [Received an OPCODE_OPEN_SERVICE packet from 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11888] [] [zmgtool] [] [ Setting protocol version for 192.168.0.133 to 2] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11888] [] [zmgtool] [] [The selected port is 38217] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11888] [] [zmgtool] [] [ Sent an OPCODE_OPEN_SERVICE ACK packet to 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Thread started for 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Received an OPCODE_REQ_CUSTOM_DATA_SIGNATURE packet from 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Sent an OPCODE_REQ_CUSTOM_DATA_SIGNATURE ACK packet to 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Received an OPCODE_REQ_PXE_MENU packet from 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [MACAddress=MƋ] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [menu:MACAddress=MƋ] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Connecting to Preboot Server at 192.168.0.6] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [recv 2, failed reading, retval = -1] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Error receiving data from Preboot Server at 192.168.0.6] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Error in getting PXE menu policy, retval=1855] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Failed to get PXE menu name file name for 192.168.0.133 (1855)] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Imaging License has expired for 192.168.0.133 (1855)] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Menu policy: Never
Menu name: pxemenu.txt
New custom data: 0
Referred: 0] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Sent an OPCODE_REQ_PXE_MENU ACK packet to 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Received an OPCODE_REQ_CFG_NAME packet from 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Connecting to Preboot Server at 192.168.0.6] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [recv 2, failed reading, retval = -1] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Error receiving data from Preboot Server at 192.168.0.6] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Error in getting CFG file] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Failed to get CFG file name for 192.168.0.133 (1855)] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Work assigned: 0
CFG name:
New custom data: 0
Kernel parms:
Referred: 0 for 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Sent an OPCODE_REQ_CFG_NAME ACK packet to 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Received an OPCODE_CLOSE_SERVICE packet from 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [ Sent an OPCODE_CLOSE_SERVICE ACK packet to 192.168.0.133] [] [] [] [Imaging]
[DEBUG] [07/08/2015 14:00:11.000] [11888] [zmgtool] [11980] [] [zmgtool] [] [Thread ended time for 192.168.0.133] [] [] [] [Imaging]

I have done some research, the zenworks ca is valid, the DNS server name an IP resolves correctly to the name in the ca, our zenworks license is active, all services running fine. I added "FORCEDHTTP=forced" to /etc/opt/novell/zenworks/preboot/novell-zenimgweb.conf and I installed the latest updates and patches. Still the same. I am totally convinced that it worked perfectly before yesterday morning and the only thing that happened then was a restart of the server. I do need some help here...