CP on Linux:
I kept trying and found that just installing poclbm as a package completely kinda fixed the 127.0.0.1 issue.
I was now back at the "error=13 permission denied" track.
I solved that by giving poclbm.exe execution rights:
Now when starting CP all is fine, CP is picking the right pool and then: nothing.

When I type info I get the stats: 0 for all.

After some time, CP starts to do a check for most efficient pool again, like it should, and then nothing again, dead silence...