I can’t add entry on White list

I would set new Antispam entry to White list on Exchange Server 2007 but I got error

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Filter-hub issue and Symantec Mail Security 5.0.1 for SMTP

Symantec Mail Security 5.0.1 for SMTP run one year without problems. After time it stops arrive new e-mails with following errors:

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AD connection failed during Move-Mailbox

I’ve got an error message about AD connection failed during Move-Mailbox:

Failed to reconnect to Active Directory server <Global Catalog FQDN>. 
Ensure the server is available and that you are using valid credentials. 

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