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Outbound UDP port 443 blocked

We have a Sophos XG135 firewall running SFOS 20.0.1 MR-1-Build342).

We have a cloud 8x8 VOIP phone soultion which is having intermittant audio issues.

We have been asked to run their network diagnostic tool which is reporting back UDP port 443 outbound is being blocked.

I have checked and there is no rule blocking this, we have also added a rule specifically to allow ALL outbound traffic on this port but i has made no difference.

Has anyone come across this or knows a way to diagnose why or how this is being blocked?

Many Thanks

Ben

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rfcat_vk 3 months ago +2 suggested

Please check to see if block quic is ticked. ian

0 rfcat_vk 3 months ago

Please check to see if block quic is ticked.

ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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0 Mayur Makvana 3 months ago

Hello,

Thank you for contacting Sophos Community.

Please review the firewall rule and see if it has Block QUIC protocol tick marked.

Mayur Makvana
Technical Account Manager | Global Customer Experience
Sophos Support Videos | Knowledge Base | @SophosSupport | Sign up for SMS Alerts |
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0 alan weir 3 months ago in reply to Mayur Makvana

QUIC could also be being blocked by application control too.
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0 Ben Rose 3 months ago

Thank you everyone, we checked all rules and did find block QUIC ticked on the main "internet access" rule however unticking it has made no difference and we still get reports from 8x8 that their "network utility" still shows outbound UDP 443 is being blocked.
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0 Mayur Makvana 3 months ago in reply to Ben Rose

Hello Ben,

I suggest raising the support case to investigate this further.

docs.sophos.com/.../index.html

Mayur Makvana
Technical Account Manager | Global Customer Experience
Sophos Support Videos | Knowledge Base | @SophosSupport | Sign up for SMS Alerts |
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0 PhilippRusch 3 months ago in reply to Ben Rose

Did you check application control?

Mit freundlichem Gruß, best regards from Germany,

Philipp Rusch

New Vision GmbH, Germany
Sophos Silver-Partner

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