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Mailcow SOGo Weblogin returns "Unhandled error response" (Docker)

Hi guys,


I wanted to make my Mailcow SOGo accessable to the internet through NGINX Proxy Manager.

I forward mailcow.domain.com to my internal IP

The subdomain is accessible from the Internet and the SSL cert is enforced.


The thing is, that the admin login works, only SOGo does not and gives me "Unhandled error response" when entering the correct credentials.

If I input wrong credentials on purpose, I get "Wrong username or password.".

Is there anything I have to change in a config?


Thank you for reading!

My Gaming PC:
Zotac RTX 3090 AMP (+750 mem +200 core. Not the best, but was MSRP. Plan on watercooling later)
i9 9900KF 5GHz 1.31V LLC6 - NZXT x72
G.Skill Trident Z @3600MHz 16GB CL16 (3466) OC
Asus Maximus X Hero

4TB Samsung NVme Storage for Windows, Games and Programs
Corsair RM-850X

Lian Li O11Dynamic
MSI Optix MAG274QRFDE-QD / ASUS ROG SWIFT PG258Q  240hz, BenQ ZOWIE XL2720 144hz, Acer S242HLDBID 60hz

Logitech G Pro Wireless Superlight
Hyper X Alloy Origins Core (Reds)


My Silent Multimedia PC:

i7 8700k delid (4.8Ghz, 1.35V) - Noctua NH-D15

Asus Strix RTX 2080 OC (Undervolt)

G.Skill Trident Z 3200MHz 16GB

Gigabyte Z390 UD (cheap but does the job)

Crucial P1 M.2 NVME 1TB (Games) + Kingston A400 240GB (Windows) + 480GB (Programs)

Corsair RM-650

Be Quiet Silent Base 601 with 2x 140mm Noctua exhaust

LG OLED 77G2 (holy fuck that thing is insane)

Logitech G Pro Wireless

Logitech MX Mechanical Mini


My Notebook:

MacBook Pro 16 M1 - 16GB


Server PVE:

Ryzen 9 3950X, MSI B450 Pro Carbon, 64GB 3200MHz, 2x 512GB NVMe ZFS RAID, 2x 14TB Mirror, 1x 3TB Shadowplay (There are like 20 VMs nad CTs on there lmao)

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