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Yahoo emails stuck in Exchange 2010 queue, Error: “421 4.4.2 Connection dropped due to SocketError”

June 23, 2011 By Damitha Anuradha Leave a Comment

Trouble when sending large (its varying) emails to Yahoo email addresses, its failing with the above error message in mail queue. (Last Error)
click here to Understanding the issue
From your Exchange server try below:
ping 74.6.136.244 -l 1472 -f
If above is not working, there’s a network device between you and Yahoo that’s either adding data to your packet or has a MTU smaller than yours. Keep reducing the 1472 until you can ping the target without getting any errors. Then set your server’s MTU accordingly on the NIC that’s being used to connect to Yahoo. (In my scenario it value is 1400)

Before you begin, backup your exchange 2010 server’s registry (which installed hub transport server role)
Open Registry Editor
  1. Go to Run
  2. Type regedit
  3. Click OK
Backup the existing settings
  1. Go to File
  2. Click Export
  3. Save
Go to below path:
computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\
Choose your relevant network interface (Eg: checking IP address, Default gateway)
Add a DWORD value
  1. Right click -> New -> DWORD Value
  2. Rename as “MTU”
  3. Right click -> Modify
  4. Add decimal value.
  • Restart your computer.
  • Try to send an email to Yahoo…
  • If anything goes wrong, restore the registry by choosing previously backed up file.
  • In Registry Editor, go to File click Import.

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