The new parcels could be distributed to all hosts exept the manager host.

The cloudera-scm-agent.log has the following info:

[24/Jul/2017 10:57:32 +0000] 7377 Thread-13 downloader INFO Starting download of: https://hadoop-name-01.xxx.xxx:7183/cmf/parcel/download/CDH-5.12.0-1.cdh5.12.0.p0.29-precise.parcel
[24/Jul/2017 10:57:32 +0000] 7377 Thread-13 downloader INFO /home/cloudera-manager/parcel-cache/CDH-5.12.0-1.cdh5.12.0.p0.29-precise.parcel.part exists, add Range header: bytes=0-
[24/Jul/2017 10:57:32 +0000] 7377 Thread-13 downloader ERROR HTTP error during download
Traceback (most recent call last):
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.12.0-py2.7.egg/cmf/downloader.py", line 108, in download
response = self.fetch_url(request)
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.12.0-py2.7.egg/cmf/downloader.py", line 79, in fetch_url
return cmf.https.ssl_url_opener.open(request)
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.12.0-py2.7.egg/cmf/https.py", line 179, in open
return self.opener(*pargs, **kwargs)
File "/usr/lib/python2.7/urllib2.py", line 406, in open
response = meth(req, response)
File "/usr/lib/python2.7/urllib2.py", line 519, in http_response
'http', request, response, code, msg, hdrs)
File "/usr/lib/python2.7/urllib2.py", line 444, in error
return self._call_chain(*args)
File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain
result = func(*args)
File "/usr/lib/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.12.0-py2.7.egg/cmf/https.py", line 214, in http_error_default
raise e
HTTPError: HTTP Error 400: Bad Request
[24/Jul/2017 10:57:32 +0000] 7377 Thread-13 downloader INFO Finished download [ url: https://hadoop-name-01.xxx.xxx:7183/cmf/parcel/download/CDH-5.12.0-1.cdh5.12.0.p0.29-precise.parcel, state: exception, total_bytes: 0, downloaded_bytes: 0, start_time: 2017-07-24 10:57:32, download_end_time: , end_time: 2017-07-24 10:57:32, code: 400, exception_msg: HTTP Error 400: Bad Request, path: None ]
[24/Jul/2017 10:57:40 +0000] 7377 MainThread agent INFO Flood daemon (re)start attempt
[24/Jul/2017 10:57:41 +0000] 7377 MainThread agent ERROR Failed starting flood: <Fault 40: 'ABNORMAL_TERMINATION: flood'> 

---- end of log ------

i could fix the problem by rebuilding the pythion environment on the maneger node.

using the following  command: virtualenv /usr/lib/cmf/agent/build/env

i'm not sure what caused the problem or if this is the correct solution but atleast distribution of the parcels works correctly  now.