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EPROTO
EPROTO is Solaris errno value 71, Protocol error
. Oracle explicitly describes this errno as device-specific and generally not related to a hardware failure. The numeric value therefore does not identify a single network protocol, packet format, or STREAMS message type.
The originating interface defines the protocol
Capture the system call or library interface, descriptor type, device or transport provider, and any module stack involved. Then use the error contract and logs of that implementation to identify which protocol state or control exchange was rejected. Treating every this result as TCP corruption loses the context Solaris says is device-specific.
For STREAMS paths, inspect adjacent control messages and module-generated errors; for a device interface, correlate with the driver's protocol diagnostics rather than replacing hardware immediately. EBADMSG is more specific when an incompatible control item or passed descriptor reaches a STREAMS queue head. This result remains the broader protocol-state/error indication and needs the producer's documentation to become actionable.
References
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