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Apple has been actively shutting down the older API endpoints that Cydia Impactor uses. As of 2023-2024, many users report that no matter what they do, "Line 37" appears because Apple simply refuses the connection.
: An all-in-one utility that includes a sideloading feature (IPA Signature) which frequently receives updates to stay compatible with Apple’s servers. cydia impactor error line 37
Line 37 was the gatekeeper. It wasn’t a bug; it was a feature —a quiet, surgical shift in how iOS signed developer certificates. Two years ago, you could generate an app-specific password and brute-force your way through. Now, the private key had to be exactly right. One wrong bit, one revoked certificate from Cupertino’s silent blacklist, and the impactor would choke. Apple has been actively shutting down the older
