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Lost Connection to MySQL server at 'reading authorization packet', system error: 0 (no replies)

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I have various databases set up, and until recently could connect to them all just fine. However this morning I tried connecting to some, and am getting the following error:

Cannot Connect to Database Server

Your connection attempt failed for user 'username' from your host to server 123.123.123.123:3306:
Lost Connection to MySQL server at 'reading authorization packet', system error: 0

and then goes onto make some suggestions like 'Check that MySQL is running'

MySQL is 5.5.34 running on Windows 2008 R2
I am connecting from Windows 7 using Workbench 6.1.7
I have 5 databases on 3 servers, and can connect to 2 of them ok, the others I get the same error.

The reason I have posted this in the workbench forum is that this problem only affects MySQL workbench. If I use the commandline or MySQL Query Browser I can connect just fine.

Is there any issue that people know of that might afflict workbench in this way?

Looking on the internet the usual suggestions are to set connect_timeout to 10 (already set to 10), set skip_name_resolve to ON (already set to ON), check Aborted_connects (goes up with each failed attempt).

I've checked the usernames / passwords multiple times already, so am at a loss as to what the issue may be. I didn't want to raise it as a Bug until I'd checked if other people have had this issue first (in case it's something I'm doing)?

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