access user mail via admin interface - Install & Setup https://community.zextras.com/forum/carbonio-setup/access-user-mail-via-admin-interface/ Zextras Community Discussion Board en-US Fri, 06 Mar 2026 17:22:49 +0000 wpForo 60 RE: access user mail via admin interface https://community.zextras.com/forum/carbonio-setup/access-user-mail-via-admin-interface/#post-10219 Fri, 28 Mar 2025 10:37:13 +0000 I tracked it down a little bit further:

When accessing via internal LAN IP everything as working as expected but when acessing via external DNS name it breaks. Also everything is sitting behind an HA-Proxy. I am wondering because the same setup works with zimbra 8.8 

]]> Install & Setup coolcat https://community.zextras.com/forum/carbonio-setup/access-user-mail-via-admin-interface/#post-10219 access user mail via admin interface https://community.zextras.com/forum/carbonio-setup/access-user-mail-via-admin-interface/#post-10217 Fri, 28 Mar 2025 07:01:16 +0000 Hello!

We have a multiserver setup. When i try to access a user mailbox via view mail button i get the following error:

HTTP ERROR 400 invalid request: missing required param: preauth

URI: /service/preauth
STATUS: 400
MESSAGE: invalid request: missing required param: preauth
SERVLET: PreAuthServlet

The admin interface is being reached by removed link and the webmail interface by removed link  
Both are behind a HAProxy.

Does anyone have an idea where to look at?

Thank you

 

Karl

 

]]> Install & Setup coolcat https://community.zextras.com/forum/carbonio-setup/access-user-mail-via-admin-interface/#post-10217