I just found this in the logs, I do not know if it is related…

PHP Fatal error: Call to undefined function
permission_db_authorized_ugroups() in
/usr/share/codendi/plugins/tracker/include/Tracker/Artifact/Tracker_Artifact.class.php
on line 182

If you have access to the server logs, you should find a message matching my attempts, this could help you a lot I think.

I get the same error with curl:

$ curl --verbose -H "X-Auth-Token: JDJ5JDE1JEwx(...)" -H "X-Auth-UserId: (...)" https://www.tuleap.net/api
/v1/projects/101/backlog
* Adding handle: conn: 0x1e22df8
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* - Conn 0 (0x1e22df8) send_pipe: 1, recv_pipe: 0
* About to connect() to www.tuleap.net port 443 (#0)
*   Trying 50.56.122.158...
* Connected to www.tuleap.net (50.56.122.158) port 443 (#0)
* successfully set certificate verify locations:
*   CAfile: C:\Program Files (x86)\Git\bin\curl-ca-bundle.crt
  CApath: none
* SSLv3, TLS handshake, Client hello (1):
* SSLv3, TLS handshake, Server hello (2):
* SSLv3, TLS handshake, CERT (11):
* SSLv3, TLS handshake, Server key exchange (12):
* SSLv3, TLS handshake, Server finished (14):
* SSLv3, TLS handshake, Client key exchange (16):
* SSLv3, TLS change cipher, Client hello (1):
* SSLv3, TLS handshake, Finished (20):
* SSLv3, TLS change cipher, Client hello (1):
* SSLv3, TLS handshake, Finished (20):
* SSL connection using DHE-RSA-AES256-SHA
* Server certificate:
*        subject: C=FR; postalCode=73370; ST=Savoie; L=LE BOURGET DU LAC; street=12 allée du Lac de garde; O=ENALEAN; OU=0002 531796621; OU=Enalean; CN=tuleap.net
*        start date: 2013-06-14 00:00:00 GMT
*        expire date: 2014-07-14 23:59:59 GMT
*        subjectAltName: www.tuleap.net matched
*        issuer: C=FR; ST=Calvados; L=Caen; O=TBS INTERNET; OU=Terms and Conditions: http://www.tbs-internet.com/CA/repository; OU=TBS INTERNET CA; CN=TBS X509 CA busin
ess
*        SSL certificate verify ok.
> GET /api/v1/projects/101/backlog HTTP/1.1
> User-Agent: curl/7.30.0
> Host: www.tuleap.net
> Accept: */*
> X-Auth-Token: JDJ5JDE1J(.....)
> X-Auth-UserId: 771
>
* HTTP 1.0, assume close after body
< HTTP/1.0 500 Internal Server Error
< Date: Thu, 12 Jun 2014 14:08:39 GMT
< Server: Apache/2.2.3 (CentOS)
< X-Powered-By: PHP/5.3.3
< Vary: Accept,User-Agent,Accept-Encoding
< Access-Control-Allow-Origin: *
< Access-Control-Allow-Credentials: true
< Access-Control-Allow-Headers: Accept, Accept-Charset, Authorization, Content-Type, Origin
< Content-Length: 0
< Connection: close
< Content-Type: text/html
<
* Closing connection 0
* SSLv3, TLS alert, Client hello (1):

You have strange output. For instance, you have Content-encoding: gzip and I've Content-Type: application/json; charset=utf-8.
Furthermore, error 500 are not thrown for this route, but for append file to an artifact.

Can you please :

- try with a CURL this route
- retry in the UI after leaving the page and doing a refresh with cleared cache

Thanks

Ok thanks for your answer.

I will check that.