vcAgent does not start

Document ID : KB000118560
Last Modified Date : 26/10/2018
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Issue:
on one of our servers the vcagent has stopped. When trying to start the service "CA USM Collector", i get an "Error 1067: The process terminated unexpectedly".

The vcagent.log ends on :
end of log :
16:44:28 Severity 4 - [ProcessConfigXML] SccpValidateReservedField: True
16:44:28 Severity 4 - [ProcessConfigXML] Returning result: 0x00000000.
16:44:28 Severity 2 - b_test failure at .\vcpacketreader.cpp 90
16:44:28 Severity 2 - The data area passed to a system call is too small.
Environment:
UCM 4.*
Cause:
Problem on the netcard : it has hung .
Resolution:
created a new netcard (virtual) ,
disabled the SPAN UCM netcard ,
assigned the SPAN IP to the new netcard ,
start the UCM collector service and it well start .

Then we changed back the IP to the old SPAN port netcard and
restart the UCM collector service and it still well start .