F5F Stay Refreshed Software Operating Systems Event ID 4227 originates from TCP source.

Event ID 4227 originates from TCP source.

Event ID 4227 originates from TCP source.

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matheusvr
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08-16-2025, 07:12 PM
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I've worked with a client facing repeated 4227 errors across all their devices and the server. After several hours of troubleshooting, I've reviewed numerous discussions on technet and similar forums. The fix involves adjusting MaxUserPort and TcpTimedWaitDelay, which seems to alleviate the problem. On a related note, they use Google App Sync for email and have experienced sync failures requiring manual retries after initial attempts often fail. Once I applied those changes to one machine, the error ceased and persisted for five days before resurfacing again—despite no sync issues earlier or later. It's puzzling that both issues appeared simultaneously after a registry update five days prior. Their systems run SBS 2011 essentials with some specialized software, though not all machines have the necessary updates installed. I haven't had time to test netstat or write a script to capture network activity at the moment. If anyone has insights on these steps or related commands, please let me know.
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M
matheusvr
08-16-2025, 07:12 PM #1

I've worked with a client facing repeated 4227 errors across all their devices and the server. After several hours of troubleshooting, I've reviewed numerous discussions on technet and similar forums. The fix involves adjusting MaxUserPort and TcpTimedWaitDelay, which seems to alleviate the problem. On a related note, they use Google App Sync for email and have experienced sync failures requiring manual retries after initial attempts often fail. Once I applied those changes to one machine, the error ceased and persisted for five days before resurfacing again—despite no sync issues earlier or later. It's puzzling that both issues appeared simultaneously after a registry update five days prior. Their systems run SBS 2011 essentials with some specialized software, though not all machines have the necessary updates installed. I haven't had time to test netstat or write a script to capture network activity at the moment. If anyone has insights on these steps or related commands, please let me know.

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