# GL-AXT1800 Firewall & Outlook **URL:** \ **Category:** Router\ **Created:** [August 10, 2023, 9:38am UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315 "2023-08-10T09:38:59Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Not\_me\_again](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/n/ecd19e/32.png) [@Not\_me\_again](https://forum.gl-inet.com/u/Not_me_again)\ **Post date:** [August 10, 2023, 9:38am UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/1 "2023-08-10T09:38:59Z")
Hi, Just switching over to the GL-AXT1800 from a AC3100 router that I am using openWRT on, for the life of me I cannot find an article on how to let Outlook through the firewall using IMAP. No VPN set up on the GL-AXT1800 so it must be the Firewall blocking Outlook right? Switching back to my AC3100 everything works fine. I have read the firewall section of the manual but it’s gibberish to me, I’m not married to ‘Office365’ so if I have to ditch it in favour of a web based email that’s fine - unless it’s straightforward on the GL-AXT1800!? Cheers ---
**Author:** ![bring.fringe18](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/bring.fringe18/32/11777_2.png) [@bring.fringe18](https://forum.gl-inet.com/u/bring.fringe18)\ **Post date:** [August 10, 2023, 6:04pm UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/2 "2023-08-10T18:04:16Z")
Is ‘Outlook’ in this context an application on your PC? System Explorer (v7) → Connections can show what ports your PC applications are trying to use. The default GL device firewall rules for outgoing traffic are permissive; there shouldn’t be anything blocking any LAN → WAN originating ports. > An IMAP server typically listens on [port number](https://wikiless.tiekoetter.com/wiki/Port_number?lang=en) 143. IMAP over [SSL/TLS](https://wikiless.tiekoetter.com/wiki/Transport_Layer_Security?lang=en) ( **IMAPS** ) is assigned the port number 993.[[2]](https://wikiless.tiekoetter.com/wiki/Internet_Message_Access_Protocol?lang=en#cite_note-blum-email-sec-2)[[3]](https://wikiless.tiekoetter.com/wiki/Internet_Message_Access_Protocol?lang=en#cite_note-practical-unix-sec-3) (_Internet Message Access Protocol,_ Wikipedia) > **[System Explorer - Keep Your System Under Control](https://systemexplorer.net/)** > > Homepage of System Explorer. Freeware Tool for displaying and managing system internals ---
**Author:** ![wcs2228](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/wcs2228/32/6112_2.png) [@wcs2228](https://forum.gl-inet.com/u/wcs2228)\ **Post date:** [August 11, 2023, 2:16am UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/3 "2023-08-11T02:16:47Z")
Office365 (now Microsoft 365) uses TCP 993 for IMAP. [https://support.microsoft.com/en-gb/office/pop-imap-and-smtp-settings-8361e398-8af4-4e97-b147-6c6c4ac95353](https://support.microsoft.com/en-gb/office/pop-imap-and-smtp-settings-8361e398-8af4-4e97-b147-6c6c4ac95353) The GL-AXT1800 router should not be blocking TCP 993 or outbound traffic by default, so it may be due to some other problem. Check your Outlook account setting to make sure it is using Port 993 and SSL/TLS and the authentication is correct. _I do not work for and I am not directly associated with GL.iNet_ ---
**Author:** ![terminalfool](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/t/e56c9b/32.png) [@terminalfool](https://forum.gl-inet.com/u/terminalfool)\ **Post date:** [December 14, 2023, 4:45pm UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/4 "2023-12-14T16:45:10Z")
Interesting. This might be related. I just added a wifi-6 device to what was previously a flawless network using an axt1800, and now it appears as though TCP 993 is blocked. ---
**Author:** ![admon](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/admon/32/32880_2.png) [@admon](https://forum.gl-inet.com/u/admon)\ **Post date:** [December 14, 2023, 4:53pm UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/5 "2023-12-14T16:53:39Z")
The firewall should not be the problem here since it usually does not block outgoing connections. So the issue will have a different reason. ---
**Author:** ![terminalfool](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/t/e56c9b/32.png) [@terminalfool](https://forum.gl-inet.com/u/terminalfool)\ **Post date:** [December 14, 2023, 5:38pm UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/6 "2023-12-14T17:38:44Z")
The firewall is blank. I’ve tried to eliminate the axt1800 as the culprit, but in its absence, everything works. ---
**Author:** ![admon](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/admon/32/32880_2.png) [@admon](https://forum.gl-inet.com/u/admon)\ **Post date:** [December 14, 2023, 5:44pm UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/7 "2023-12-14T17:44:04Z")
Do you use Adguard for example? ---
**Author:** ![terminalfool](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/t/e56c9b/32.png) [@terminalfool](https://forum.gl-inet.com/u/terminalfool)\ **Post date:** [December 14, 2023, 8:43pm UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/8 "2023-12-14T20:43:46Z")
Resetting the firmware solved the problem, whatever it was. ---
**Author:** ![bruce](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/bruce/32/35649_2.png) [@bruce](https://forum.gl-inet.com/u/bruce)\ **Post date:** [October 29, 2025, 4:28am UTC](https://forum.gl-inet.com/t/gl-axt1800-firewall-outlook/32315/9 "2025-10-29T04:28:10Z")