OPC configuration for SCADA as client or server won't have much problem as IntegraXor will automatically configure the registry entries for DCOM. However, the remote OPC client/server may be tricky if the remote OPC client/server itself doesn't automatically configure the necessary entry.

Automatic configuration of the remote client/server for granting external access can be done by executing registry file, which can be requested or download from IntegraXor website. Alternatively, it can be created manually by copying the following code to paste into a new text file, then save as remote-opc.reg.

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\AppID\{13486D44-4821-11D2-A494-3CB306C10000}]
@="OpcEnum"
"AuthenticationLevel"=dword:00000001
"ServiceParameters"="-Service"
"AccessPermission"=hex:01,00,04,80,9c,00,00,00,b8,00,00,00,00,00,00,00,14,00,\
  00,00,02,00,88,00,06,00,00,00,00,00,14,00,07,00,00,00,01,01,00,00,00,00,00,\
  05,0a,00,00,00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,05,07,00,00,00,\
  00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,01,00,00,00,00,00,00,14,00,1f,\
  00,00,00,01,01,00,00,00,00,00,05,04,00,00,00,00,00,14,00,1f,00,00,00,01,01,\
  00,00,00,00,00,05,02,00,00,00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,\
  05,12,00,00,00,53,00,39,00,30,00,43,00,01,05,00,00,00,00,00,05,15,00,00,00,\
  6b,d6,62,04,07,e9,94,2d,15,25,af,47,eb,03,00,00,01,05,00,00,00,00,00,05,15,\
  00,00,00,6b,d6,62,04,07,e9,94,2d,15,25,af,47,eb,03,00,00
"LaunchPermission"=hex:01,00,04,80,a0,00,00,00,bc,00,00,00,00,00,00,00,14,00,\
  00,00,02,00,8c,00,06,00,00,00,00,00,18,00,1f,00,00,00,01,02,00,00,00,00,00,\
  05,20,00,00,00,20,02,00,00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,05,\
  07,00,00,00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,01,00,00,00,00,00,\
  00,14,00,1f,00,00,00,01,01,00,00,00,00,00,05,04,00,00,00,00,00,14,00,1f,00,\
  00,00,01,01,00,00,00,00,00,05,02,00,00,00,00,00,14,00,1f,00,00,00,01,01,00,\
  00,00,00,00,05,12,00,00,00,69,00,6e,00,64,00,69,00,01,05,00,00,00,00,00,05,\
  15,00,00,00,6b,d6,62,04,07,e9,94,2d,15,25,af,47,eb,03,00,00,01,05,00,00,00,\
  00,00,05,15,00,00,00,6b,d6,62,04,07,e9,94,2d,15,25,af,47,eb,03,00,00
"LocalService"="OpcEnum"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole]
"DefaultLaunchPermission"=hex:01,00,04,80,dc,00,00,00,ec,00,00,00,00,00,00,00,\
  14,00,00,00,02,00,c8,00,08,00,00,00,00,00,18,00,1f,00,00,00,01,02,00,00,00,\
  00,00,05,20,00,00,00,20,02,00,00,00,00,24,00,1f,00,00,00,01,05,00,00,00,00,\
  00,05,15,00,00,00,6b,d6,62,04,07,e9,94,2d,15,25,af,47,f5,01,00,00,00,00,18,\
  00,1f,00,00,00,01,02,00,00,00,00,00,05,20,00,00,00,22,02,00,00,00,00,14,00,\
  1f,00,00,00,01,01,00,00,00,00,00,05,07,00,00,00,00,00,14,00,1f,00,00,00,01,\
  01,00,00,00,00,00,01,00,00,00,00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,\
  00,05,04,00,00,00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,05,02,00,00,\
  00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00,73,00,79,00,\
  73,00,74,00,01,02,00,00,00,00,00,05,20,00,00,00,20,02,00,00,01,02,00,00,00,\
  00,00,05,20,00,00,00,20,02,00,00
"MachineLaunchRestriction"=hex:01,00,04,80,dc,00,00,00,ec,00,00,00,00,00,00,00,\
  14,00,00,00,02,00,c8,00,08,00,00,00,00,00,18,00,1f,00,00,00,01,02,00,00,00,\
  00,00,05,20,00,00,00,20,02,00,00,00,00,24,00,1f,00,00,00,01,05,00,00,00,00,\
  00,05,15,00,00,00,6b,d6,62,04,07,e9,94,2d,15,25,af,47,f5,01,00,00,00,00,18,\
  00,1f,00,00,00,01,02,00,00,00,00,00,05,20,00,00,00,22,02,00,00,00,00,14,00,\
  1f,00,00,00,01,01,00,00,00,00,00,05,07,00,00,00,00,00,14,00,1f,00,00,00,01,\
  01,00,00,00,00,00,01,00,00,00,00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,\
  00,05,04,00,00,00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,05,02,00,00,\
  00,00,00,14,00,1f,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00,73,00,79,00,\
  73,00,74,00,01,02,00,00,00,00,00,05,20,00,00,00,20,02,00,00,01,02,00,00,00,\
  00,00,05,20,00,00,00,20,02,00,00
"MachineAccessRestriction"=hex:01,00,04,80,c4,00,00,00,d4,00,00,00,00,00,00,00,\
  14,00,00,00,02,00,b0,00,07,00,00,00,00,00,24,00,07,00,00,00,01,05,00,00,00,\
  00,00,05,15,00,00,00,6b,d6,62,04,07,e9,94,2d,15,25,af,47,f5,01,00,00,00,00,\
  18,00,07,00,00,00,01,02,00,00,00,00,00,05,20,00,00,00,22,02,00,00,00,00,14,\
  00,07,00,00,00,01,01,00,00,00,00,00,05,07,00,00,00,00,00,14,00,07,00,00,00,\
  01,01,00,00,00,00,00,01,00,00,00,00,00,00,14,00,07,00,00,00,01,01,00,00,00,\
  00,00,05,04,00,00,00,00,00,14,00,07,00,00,00,01,01,00,00,00,00,00,05,02,00,\
  00,00,00,00,14,00,07,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00,3b,00,2e,\
  00,56,00,42,00,01,02,00,00,00,00,00,05,20,00,00,00,20,02,00,00,01,02,00,00,\
  00,00,00,05,20,00,00,00,20,02,00,00
"EnableDCOM"="Y"
"LegacyAuthenticationLevel"=dword:00000002
"DefaultAccessPermission"=hex:01,00,04,80,d8,00,00,00,e8,00,00,00,00,00,00,00,\
  14,00,00,00,02,00,c4,00,08,00,00,00,00,00,24,00,07,00,00,00,01,05,00,00,00,\
  00,00,05,15,00,00,00,6b,d6,62,04,07,e9,94,2d,15,25,af,47,f5,01,00,00,00,00,\
  18,00,07,00,00,00,01,02,00,00,00,00,00,05,20,00,00,00,22,02,00,00,00,00,14,\
  00,07,00,00,00,01,01,00,00,00,00,00,05,0a,00,00,00,00,00,14,00,07,00,00,00,\
  01,01,00,00,00,00,00,05,07,00,00,00,00,00,14,00,07,00,00,00,01,01,00,00,00,\
  00,00,01,00,00,00,00,00,00,14,00,07,00,00,00,01,01,00,00,00,00,00,05,04,00,\
  00,00,00,00,14,00,07,00,00,00,01,01,00,00,00,00,00,05,02,00,00,00,00,00,14,\
  00,07,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00,53,00,5c,00,73,00,79,00,\
  01,02,00,00,00,00,00,05,20,00,00,00,20,02,00,00,01,02,00,00,00,00,00,05,20,\
  00,00,00,20,02,00,00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\AppCompat]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\AppCompat\ActivationSecurityCheckExemptionList]
"{A50398B8-9075-4FBF-A7A1-456BF21937AD}"="1"
"{AD65A69D-3831-40D7-9629-9B0B50A93843}"="1"
"{0040D221-54A1-11D1-9DE0-006097042D69}"="1"
"{2A6D72F1-6E7E-4702-B99C-E40D3DED33C3}"="1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\NONREDIST]
"System.EnterpriseServices.Thunk.dll"=""