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Category: WHMCS

Prefer/Precedence IPv4 over IPv6 for DNS lookups

We had an issue with DNS lookup/Querying the whois servers(Example: whois.crsnic.net) while Domain Search/Registration for any TLDs through WHMCS, Domain Manager etc. The tool/system used to timeout whenever the users searched a domain for availability. We found the following via CLI when telnet’ing to the whois server directly. The above indicates it attempts IPv6 DNS lookup first but the whois server doesn’t support or provide it, later our server tries IPv4 DNS lookup and it […]