Microsoft has admitted that one of the dozen security patches it released last week is preventing dial-up internet services for some users.
The MS06-025 patch was one of 12 patches that fixed 21 flaws in Windows and other Microsoft products.
MS06-25 repairs two “critical” security flaws in Windows, which could allow remote hackers to take over machines without any user interaction.
Problems with the patch occur with dial-up connections that use a terminal window, or dial-up scripting, said Microsoft.
Microsoft said such connections may stop working after the patch is applied. Connectivity scenarios affected by the problem include direct-dial connections to a corporate network, ones to a university network or connections to some ISPs, said Microsoft.
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Microsoft said it was now working on an alternative patch that could be applied.
No attacks using the flaws repaired by MS06-25 have so far been reported in the wild.
Microsoft was forced to issue an alternative security patch in April, after it caused problems for some users’ third party software.