This version of Unity is unsupported.
Method group is Obsolete

NetworkMessage.MaxMessageSize

Obsolete The high level API classes are deprecated and will be removed in the future. public static int MaxMessageSize;

Description

The size of the largest message in bytes that can be sent on a NetworkConnection.

Note that channels that are not Fragmented cannot send messages larger than the Maximum Transmission Unity (MTU) size, which is about 1400 bytes by default.