Firefox can't establish a connection to the server at issues.dlang.org.

[kdevel]

$ host issues.dlang.org
Host issues.dlang.org not found: 3(NXDOMAIN)

BTW: Why is the domain hostet at cloudflare?

$ host -t ns dlang.org
dlang.org name server brian.ns.cloudflare.com.
dlang.org name server kiki.ns.cloudflare.com.

and why is the forum TLS operated by cloudflare?

$ host forum.dlang.org
forum.dlang.org has address 104.21.37.229
forum.dlang.org has address 172.67.214.172
[...]

$ jwhois  104.21.37.229
NetRange:       104.16.0.0 - 104.31.255.255
CIDR:           104.16.0.0/12
NetName:        CLOUDFLARENET

$ jwhois
NetRange:       172.64.0.0 - 172.71.255.255
CIDR:           172.64.0.0/13
NetName:        CLOUDFLARENET

Are you aware that cloudflare has access to the plaintext of the 
whole communication?