Slow browsing in Sophos xg 330 firewall firmware version SFOS 19.5.2 MR-2-Build624 after changing ISP dns

Hi Rouhullah,

Thank you for reaching out to Sophos Community.

Have you tried to use any how-to videos, documentation, Sophos Assistant, or KBA to try to check the issue?

To verify, the issue only occurs after the change of DNS from ISP. Have you reached out to them and verified the issue?

You may also try to check the following KB which might assist you

• Sophos Firewall: Intermittent DNS failures or slow DNS resolution
• Sophos Firewall: Troubleshoot slow browsing
•  XGS2100 (SFOS 18.5.1 MR-1-Build326) the internet is so slow  case 1

An internal DNS server is configured for LAN users and all DNS requests are directed to it. Issues with the Internal DNS Server or the External DNS Server, to which it forwards requests, may result in overall slow browsing.
 
Resolution: To resolve this issue, contact appropriate administrators or Server vendors.

Dear Erick Jan!

Greetings of the day.

Thanks a lot from your support, the issue got solved. The ISP was applied a filtration system inside our link after troubleshoot with them they removed the filtration and now our webpage browsing working so fine and fast.

Thanks & Regards,

Rouhullah Ahmadi 

Hi Rouhullah,

That is great to hear and thank you for sharing the update.

Hi Rouhullah,

That is great to hear and thank you for sharing the update.