Event ID - 252

Event Id252
DescriptionAn internal MTA error has occurred. No supporting stack configured for OSI entity: %1\n
Event InformationAccording to Microsoft:
Microsoft Exchange Server configured with the Eicon X.25 stack may be set to an incorrect number of control blocks or virtual circuits.
1. Start Registry Editor (Regedt32.exe).
2. Locate the "Eicon X.25 Connections" value under the following key in the registry:
3. Verify that this value (DWORD) has NOT been configured for a value greater than 32 decimal. If it has, change the setting to less than 32 decimal. See the More Information section below.
4. Quit Registry Editor.
Reference LinksXCON: Eicon X.25 Limited to Control Block Value of 32

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