[PROBLEM] RPI Can't connect to MySQL server on '192.168.0.20' (111)

[Shark]

Hi i have a big problem with my RPI.

Sorry for my bad english i'am german.

Setup:

RPI model B+ with fresh xbian RC2 then upgrade to RC3 with the xbian-config
Installed MYSQL on the RPI (xbmc user has grant rights)

When i started xbian the RPI can't connect to the local MySQL Server but my Windows 7 PC can connect to the same MySQL Server.

I have commented out the bind adress in my.cnf (# bind-address = 127.0.0.1)

I try set the bind.adress to 0.0.0.0 and 192.168.0.20 but the same error.

btw. I have the same system on another sd card and there it works fine

Thx for help

Infos:

Software
XBian version: 1.0RC 3
XBMC version: 13.2Git.20140828-c016586(compiled Aug 28 2014)
Overclock settings: default
Update Status: up to date

Hardware
Power supply rating: 2000 mAh ,5V
RPi model (model A/B 256mb/512mb): B+ 512mb
SD card size and make/type: Medion Micro-SDHC-Card, Class6, 8GB (only for testing)
Network (wireless or LAN): LAN over TP-Link TL-SF1008D Desktop Switch
Connected devices (TV, USB, network storage, etc.): active usb hub with 1 hdd 500GB. HDMI to Toshiba TV