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When importing an existing SSL certificate into the vSphere Replication Server, the required file format is PKCS#12. This format is essential because it allows for the secure storage of both the SSL certificate and its associated private key in a single file, which is necessary for establishing a secure connection.

PKCS#12 files typically have a .pfx or .p12 extension and are commonly used for importing certificates alongside their private keys into applications or services that require them. This encapsulation simplifies the process of importation, as it eliminates the need for separate handling of the certificate and key files.

Other formats, while they serve different purposes, do not fulfill the requirements for vSphere Replication Server. DER is a binary format for X.509 certificates but does not include the private key. PEM is a base64 encoded format that also does not encapsulate the key and certificate together by default. PKCS#7 is mainly used for signing and encrypting data rather than for certificate storage with a private key. Thus, PKCS#12 uniquely fulfills the need for vSphere Replication Server's SSL certificate import process.