After the symptoms appeared, I checked the following, but the cause is unknown.After about two days, the symptoms disappeared.
1. Contact Microsoft (office365) but answer that there is no symptom
2. When I looked it up on the Internet, there were no tweets showing the phenomenon.
3. Turn off the security software and there is no change.
Also, pop3pops (SSL communication)
Is there anything else I need to check? There are just under 20 PCs with symptoms.Windows 7 Windows 10 is mixed.
Routers do not have the ability to limit a particular port.
mail
First of all, it's almost impossible to find out what's going on afterwards if you're not experiencing any symptoms at this time.
The content of the question alone is too little information to even indicate the direction of the investigation.The only thing I can check in the beginning is whether the LAN cable is misconnected and looped.
If you don't expect it to be a fluke, you'll have to be prepared and wait for the phenomenon to occur, so we recommend that you ask a well-informed dealer.
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