What I’m trying to do here is creating CNAME record for DCV purposes. Previously, we were able to add target value with 98 characters, now I’m trying to change to a new value with 97 character and it didn’t let me to do so with an error “The maximum target label length is 63 characters” and it gets more weird when I able to save by changing some character inside the previous target but unable to save a whole new value for new target. Could someone tell me why is this happen?
A DNS label has always been limited to 63 octets, and the complete name is limited to 255 octets.
Are you sure you are being asked to create a CNAME?
Can you share a screenshot of the instructions your CA is providing. (Redact your own domain name)
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Here is the link:
https://support.comodoca.com/articles/Knowledge/Domain-Control-Validation-DCV-MethodsIt requiring me to create the CNAME record right?
Based on the screenshot that looks like a bug… if you can open a ticket you should … else maybe someone will escalate it.
note that a hex (base-16) encoded SHA-256 hash will not fit in a single DNS label because it is too long.
The SHA-256 hash should therefore be split into two labels, each 32 characters long.
In all the examples they give there is a period in the middle of the SHA-256 hash.
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Yup, after I put a period next to the 32nd character, then I’m able to save the record. Thanks mate.
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