google.com is on and off and some time not accessible at all

Question

Since I have deployed Sophos XGS 4300, I have been experiencing significant network slowness. Additionally, I have encountered issues accessing Google.com, and occasionally Gmail.com, as they seem to be intermittently unavailable. 
 any one can help me to resolve this issue? Please

Vivek Jagad · Answer

Hello Jean Pierre HABIMANA , Thank you for reaching out to the community, I recommend you to follow the Sophos Firewall: Best practices .

da DAI · Answer

Hello, yes I could tracert to google.fr. I believe this problem is linked to "QUIC" problem known by Sophos. the weird part is I didn't select "Block QUIC traffic" in FIrewall setting. anyway, I switched to Microsoft Edge, seems works fine until now (the other browsers all suffer the same problem)

google.com is on and off and some time not accessible at all

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