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 Starting portqry.exe -n 127.0.0.1 -e 500 -p UDP ...


Querying target system called:

 127.0.0.1

Attempting to resolve IP address to a name...


IP address resolved to london.contoso.msft

querying...

UDP port 500
Using source port UDP 500

Cannot use source port 500, this port is already in use
Remote ISAKMP/IPSec services may only communicate with source port 500
Temporarily turn off the 'IPSEC Policy Agent' or 'IPSEC Services'
on the system you are running PortQry from and run the command again


example: net stop PolicyAgent
         run PortQry to query ISAKMP
         net start PolicyAgent
portqry.exe -n 127.0.0.1 -e 500 -p UDP exits with return code 0x00000063.