Hello,
It looks like something has changed in your environment last days: dev_disp log shows this Fatal Error:
*** DP_FATAL_ERROR => DpMsAttach: local hostname 'KNVDEVP01' is resolved to loopback address (cf. SAP note 1054467 for details)
and just after that:
*** DISPATCHER EMERGENCY SHUTDOWN ***
As you can read, the error points you to SAP Note 1054467 - Local host name refers to loopback address
Regards,
Cris