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CERTSRV_E_ENCODING_LENGTH
CERTSRV_E_ENCODING_LENGTH The issued certificate has an encoded length that can be incompatible with older enrollment clients. The certificate may be technically valid, but legacy client software can fail to handle it.
What to check
- Identify the client and enrollment component that consumes the certificate; do not assume a current Windows client is the failing party.
- Compare the certificate extensions, SAN count, subject size, and key type with a working certificate from the same CA.
- If old clients must remain supported, use a template and extension set compatible with their documented capabilities rather than truncating security-relevant data blindly.
Microsoft: Certificate template concepts
Microsoft: Active Directory Certificate Services overview
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