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After noticing server-side problems with TCP-communication on Solaris, IRIX and MacOS X, I modified the function SDLNet_TCP_Accept in SDLnetTCP.c to print whether or not the socket returned by accept is blocking using the code below:

int currentMode = fcntl(sock->channel, F_GETFL, 0);
printf("%d\n", currentMode & O_NONBLOCK);

When executed, printf printed non-zero values. When tested under Linux, printf printed 0. So apparently the socket returned by accept is a blocking or non-blocking socket depending on the operating system.

I fixed this by forcing the socket returned to block using the code below:

int currentMode = fcntl(sock->channel, F_GETFL, 0);
fcntl(sock->channel, F_SETFL, currentMode & ~O_NONBLOCK);

I suggest forcing the socket returned by accept to block on all UNIX-platforms, as it will not make a difference on other operating systems like Linux where accept returns a blocking socket anyway.