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.
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.