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There could be several reasons for receiving an SSL exception when utilizing gRPC in a docker environment. Some of the common reasons include:

1. Certificate validation issues: If the SSL certificate used for TLS encryption is not valid or is self-signed, it can result in the SSL exception.

2. Network configuration issues: Firewall rules, NAT configuration, or DNS resolution issues can cause problems with SSL/TLS handshake and result in SSL exceptions.

3. CA trust issues: If the root CA certificate which signed the SSL/TLS certificate is not trusted on the client or server side, SSL exceptions can occur.

4. Configuration issues: Incorrect or incomplete configuration of gRPC SSL/TLS can lead to SSL exceptions.

5. Inconsistent or incompatible gRPC versions: Incompatibility issues between gRPC server and client versions can result in SSL exceptions.