Webmail Access

[wolvepy]

Hi,

I have a problem related with this.
I am trying to configure a sub domain for my Roundcube webmail.... like webmail.domain.tld
I did as TGates mentioned above... but I got a  "Internal Server Error" message.
DNS Record was already created for webmail.domain.tld.
This is what I got in apache error log:

[Thu Aug 18 09:18:34 2016] [crit] [client x.x.x.x] configuration error: couldn't perform authentication. AuthType not set!: /favicon.ico, referer: http://webmail.domain.tld/

I read all posts in this thread but there's a lot of advises for different OS's that is so confusing to know which one to follow. I know, every case is different.

I used apache config in sentora panel but that only appends my configuration to the one it does even if I override my subdomain for webmail.

Don't know where and what to check.