Changed it to the api.bitcoin.cz, what do these rejected blocks mean? and how do I fix them?

Starting DiabloMiner (GPU)...
-----------------------------
[11/6/13 2:09:42 PM] Started
[11/6/13 2:09:42 PM] Connecting to: http://api.bitcoin.cz:8332/
[11/6/13 2:09:43 PM] Added Radeon HD 4850 (#1) (10 CU, local work size of 256)
[11/6/13 2:10:33 PM] Rejected block 1 found on Radeon HD 4850 (#1)
[11/6/13 2:10:44 PM] Rejected block 2 found on Radeon HD 4850 (#1)
[11/6/13 2:10:57 PM] Rejected block 3 found on Radeon HD 4850 (#1)
51988/52718 khash/sec

Hey, new guy here. I am running Mac OSX (Mavericks) with Diablo Miner to Slush's Pool.

I am trying to connect to mining.bitcoin.cz:8332

This is what happens:

Starting DiabloMiner (GPU)...
-----------------------------
[11/6/13 12:11:17 PM] Started
[11/6/13 12:11:17 PM] Connecting to: http://mining.bitcoin.cz:8332/
[11/6/13 12:11:17 PM] Added Radeon HD 4850 (#1) (10 CU, local work size of 256)
[11/6/13 12:11:22 PM] ERROR: Can't connect to Bitcoin: connect timed out
[11/6/13 12:11:27 PM] ERROR: Can't connect to Bitcoin: connect timed out
[11/6/13 12:11:32 PM] ERROR: Can't connect to Bitcoin: connect timed out
[11/6/13 12:11:32 PM] ERROR: Can't connect to Bitcoin: connect timed out
[11/6/13 12:11:37 PM] ERROR: Can't connect to Bitcoin: connect timed out
[11/6/13 12:11:43 PM] ERROR: Can't connect to Bitcoin: connect timed out
[11/6/13 12:11:43 PM] ERROR: Can't connect to Bitcoin: connect timed out
[11/6/13 12:11:47 PM] ERROR: Can't connect to Bitcoin: connect timed out
64731/79379 khash/sec

the khash/sec fluctuates constantly with a continuing list of "timed out's" above.

I tried to connect to  mining.bitcoin.cz:8332 via my browser, but it can't connect to that either. No firewalls to my knowledge. Help! Thanks!