C - socket bind() errno 22 - no time-wait sockets - c

Question

I am quite new to C & Linux and I tried to setup a TCP socket server for Data exchange with a C-Code I compiled and executed on a Ubuntu System.
From a Tutorial I copied the following code (see below, the original version didn't include exception handling) and it worked to start the server and receive data (time & date) with a client code (on the same machine for test purpose).
Then I restarted the Ubuntu machine and since then I can't start the server anymore.
I then added exception handling to the code below and it throws "unable to bind" with errorno 22, which means "invalid argument"? This doesn't make sense to me, as the same code worked before quite good.
I assumed that the "old" socket is in a time-wait state or not closed yet, but I checked all connections with "ss -all state xxx" for all different states and everything seems alright.
Also tried to use different ports and codes - same problem.
Hope anyone can help me with this problem as I don't know what else to try.
// C-Code Server
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
int main(int argc, char *argv[])
{
int listenfd = 0, connfd = 0;
struct sockaddr_in serv_addr;
char sendBuff[1025];
time_t ticks;
//Open a socket
listenfd = socket(AF_INET, SOCK_STREAM, 0);
memset(&serv_addr, '0', sizeof(serv_addr));
memset(sendBuff, '0', sizeof(sendBuff));
if (listenfd == -1) {
printf("Error: unable to open a socket\n");
exit(1);
}
//Create an Adress
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htons(INADDR_ANY);
serv_addr.sin_port = htons(1234);
//Macht schon benutzte Adresse mit SO_REUSEADDR nutzbar
int opt = 1;
if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt))<0) {
perror("setsockopt");exit(EXIT_FAILURE);
}
if(setsockopt(listenfd, SOL_SOCKET, SO_REUSEPORT, (char *)&opt, sizeof(opt))<0) {
perror("setsockopt");exit(EXIT_FAILURE);
}
bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
if ((bind(listenfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr))) == -1) {
printf("Error: unable to bind\n");
printf("Error code: %d\n", errno);
exit(1);
}
listen(listenfd, 10);
while(1)
{
connfd = accept(listenfd, (struct sockaddr*)NULL, NULL);
if (connfd == -1) {
printf("Error: unable to accept connections\n");
printf("Error code: %d\n", errno);
exit(1);
}
ticks = time(NULL);
snprintf(sendBuff, sizeof(sendBuff), "%.24s\r\n", ctime(&ticks));
write(connfd, sendBuff, strlen(sendBuff));
close(connfd);
sleep(1);
}
}