Kopano behind reverse proxy

FabianRenntronic

Hello everyone, currently I am using Kopano4UCS on a server behind a firewall. For security reasons, I want to put the server behind a reverse proxy. I set up a system using nginx which forwards /webapp, /Autodiscover and /Microsoft-Server-ActiveSync to the clients. The clients are Outlook 2019 with KOE and Android Smartphones using Nine. The clients could connect to the server and incoming mails were deliverend correctly, however outgoing mails were stuck in Outlook which was displaying ‘Sending item 1 of 1’ with the progressbar being almost at the end, but the mail never got out. Everything else worked. Also the mobile sync of calendar and contact data.

Is there a special configuration which I need to apply or did I miss something?

Thanks in advance for your help.

externa1

@FabianRenntronic
What i have set for apache2 as reverse proxy for exchange 2016 server is:

<Directory /Microsoft-Server-ActiveSync>
SSLRenegBufferSize 31457280
</Directory>

which should fix a problem sending attachments > 128kb to 30MB in this case

maybe that may fix your problem too
also i set a connectiontimeout=900 to the ProxyPass line

rg
Christian

Manfred

Hi @FabianRenntronic,

did you check Z-Push, KOE and webserver’s logs?

Manfred

FabianRenntronic

@Manfred I checked the logs of my reverse proyx and had the errors “upstream timed out (110: Connection timed out)” and “client intended to send too large body” which fit to the suggestions of @externa1. For nginx the working config settings for me are:

client_max_body_size 100M;
proxy_read_timeout 300;

I added them to every “server” configuration and it works now.

Thank you very much!

Fabian