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There are a few things that can be done to troubleshoot and solve issues with b2.exe failing while building Boost on Cygwin:

1. Check if all required packages are installed - Make sure that all the necessary packages and dependencies are installed on your system. You can use the Cygwin installer to check and install any missing packages.

2. Run the command as administrator - Try running the build command as an administrator by opening Cygwin with admin privileges. This can sometimes help with permission issues.

3. Clean the build directory - Remove any previously generated object files or temporary files in the build directory as they may be causing conflicts with the current build process.

4. Try building with different flags - Sometimes, building with different flags may help resolve the issue. You can try using different configuration options or enabling/disabling certain features.

5. Check for any error messages - Look for any error messages or warnings that are displayed during the build process. These can often provide valuable insights into what may be causing the issue.

6. Seek help from the community - If all else fails, the Boost community may be able to help. You can search the Boost mailing list archives, ask a question on Stack Overflow or the Boost user forum, or contact the Boost developers directly for assistance.