ADB and Genymotion error: "adb server is out of date. killing... cannot bind 'tcp:5037' ADB server didn't ACK"

update the adb to 1.0.32 if you have 1.0.31 or lower

adb version
Android Debug Bridge version 1.0.31
wget -O - https://skia.googlesource.com/skia/+archive/cd048d18e0b81338c1a04b9749a00444597df394/platform_tools/android/bin/linux.tar.gz | tar -zxvf - adb
sudo mv adb /usr/bin/adb
sudo chmod +x /usr/bin/adb
adb version
Android Debug Bridge version 1.0.32

Neither of those solutions worked for me at all.

The solution which solved my error was to add both the missing /Android/Sdk/tools & /Android/Sdk/platform-tools directories to my Environment PATH variable,this can be achieved with the following command:

export PATH=/home/{username}/Android/Sdk/tools:/home/{username}/Android/Sdk/platform-tools:$PATH

Be sure to interpolate your own username into the command, replacing {username} with your operating system username.

Doing so will direct your command line to search your Environmant's PATH variable for the proper location of the adb executable, without this environment variable set, your system does not know where to look for the correct executable.

The root cause for this issue is that you try to run adbs of different versions. PC(Host) side adb is made of two parts: adb and adb server.

adb <----> adb server <--------USB-------> adbd(device)

adb and adb server actually is the same binary, but adb server is running at background when you first issue a adb command. After that, adb command will contact which adb server each time you run adb, and first of all it check the versions of running adb server. If version is not match, then you will see 'adb server is out of date. killing...'. This is the only reason.

int adb_connect(const std::string& service, std::string* error) {
    // first query the adb server's version
    int fd = _adb_connect("host:version", error);
...
        if (version != ADB_SERVER_VERSION) {
            printf("adb server is out of date.  killing...\n");
            fd = _adb_connect("host:kill", error);
            adb_close(fd);

            /* XXX can we better detect its death? */
            adb_sleep_ms(2000);
            goto start_server;
        }

To resolve this problem, you just need to make sure you are not tring to run different version adb.

1. Find the binary path of running adb server by using a task manager tool, search "adb". check its version using command

[path to adb server]/adb version

The output like this:

Android Debug Bridge version 1.0.35
Revision 68de85bda98d-android

"1.0.35" is the version number.

2. check the version of the adb which cause your problem. just type

adb version

3. compare the version numbers, they must match.

if they are not matched, you can:

• just keep only one adb, delete others.
• or you can ignore the error. if it always shows, find out who is running different adb tool for you and stop it. For example, some phone assistant program.