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iOS 5 no longer recognizes some X.509 certificates as valid

Symptoms

iOS 5 removed support for X.509 certificates signed with the MD5 hash algorithm. Attempting to use a certificate that would otherwise be valid, but is signed with the MD5 algorithm, will not succeed.

Resolution

Update your certificates to a newer version with a secure signature algorithm.

Last Modified: Feb 28, 2012
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  • Last Modified: Feb 28, 2012
  • Article: TS4133
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