[tor-relays] Tor 2.6.10 fails to generate fresh DH Keys

Bug: Assertion r == 0 failed in crypto_generate_dynamic_dh_modulus at ../src/common/crypto.c:1788.

Looks like you have DynamicDHGroups enabled in your torrc file.

This is interesting because the recent LogJam research indicates the NSA has probably broken commonly used 1024 bit DH groups, which suggests turning on this parameter.

However it was disabled by default some time ago for anti-fingerprinting reasons:

https://trac.torproject.org/projects/tor/ticket/5598

AND, it's probably a moot issue now that Ntor handshakes (elliptic curve) have overtaken older RSA connections.

So you should delete

DynamicDHGroups 1

from torrc and let it be disabled by default.