Request on AEM 6.4 author to /libs/granite/csrf/token.json is pending forever

Hello,

i have problems getting a CSRF token on a fresh installed AEM 6.4.0 author instance on ubuntu linux.

The setup is:

Ubuntu 18.04.2 LTS

Java(TM) SE Runtime Environment (build 1.8.0_181-b13)

Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)

I install the author with the command

java -jar cq5-author-p4502.jar -r author (i tried with and without nosamplecontent, it doesn't matter)

and after startup everything works well.

If i stop the installation and restart it via the command

/crx-quickstart/bin$ ./start

or any other startup script, i tried alot of things,

i am not able to receive a valid csrf token because every request to

http://x.x.x.x:4502/libs/granite/csrf/token.json

is pending forever and never returns.

I got it to work one time after i restarted the CSRF service manually, but only once...

Even if i update the version to 6.4.3 i have the same problem.

On Windows 7/10 everything works fine with the same steps described above.

Thank you for your help,

Thorsten Köhler