Event ID - 4020

Event Id4020
SourceMSExchangeIMC
DescriptionUnable to start the service because WINSOCK could not be initialized.
Event InformationAccording to Microsoft:
CAUSE:
This issue may occur if the Simple Mail Transfer Protocol (SMTP) entry in the Services file is missing or is commented out.
RESOLUTION:
To verify that the SMTP entry exists, follow these steps:
1. Open the Services file by using a text editor such as Notepad.
2. If the SMTP entry exists but is commented out, remove the number sign (#) at the beginning of the line.
3. If the SMTP entry does not exist, use one of the following methods:
In Windows NT 4.0, position your cursor on a new line at the end of the file, and then type the following text on that line:
smtp 25/tcp mail
In Windows 2000, position your cursor on a new line at the end of the file, and then type the following text on that line:
smtp 25/tcp mail #Simple Mail Transfer Protocol
4. Save the file.
5. Quit Notepad.
Reference LinksYou receive a "The service did not respond to the start or control request in a timely fashion" error message when you use the Internet Mail Service Wizard in Exchange Server 5.5 SP3

XCON: Internet Mail Service Wont Start - Event ID 4007 & 4020

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