It means that: 1) your server is down; 2) your server can't contact RIM Ops Center (ROC); 3) your blackberry can't contact the ROC; or 4) the blackberry hasn't established a tunnel to your server.
I find this happens occasionally. 1 and 2 may or may not come back, depends of the problem. 3 and 4 and usually temporary and related to availability of data services, and usually comes back quickly.
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