Cant reach emails using Horde - Fatal error

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http://forums.cpanel.net – Hello all, Im running multiple websites and for one of them I had to change DNS settings to start using Cloudflare CDN services. After changing DNS I was unable to connect emails because I got "ip address has changed" error. I created subdomain using cpanel proxy to login (followed these instructions) but now when I go webmail.mydomain.com and choose Horde I get following message: "A fatal error has occurred Session cookies will not work without a FQDN and with a non-empty cookie domain. Either use a fully qualified domain name like "http://www.example.com" (HowTos)