pool.ntp.casjaydns.com has no SRV records.
Question and response
Question
dig casjay.pool.ntp.org. SRV
Answer
The response has no answer records.
Authority
pool.ntp.org. 1300 SOA e.ntpns.org. hostmaster.pool.ntp.org. 1772043923 5400 5400 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0