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-rw-r--r--netlib/certutils.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/netlib/certutils.py b/netlib/certutils.py
index b3ddcbe4..69530245 100644
--- a/netlib/certutils.py
+++ b/netlib/certutils.py
@@ -12,7 +12,8 @@ from pyasn1.codec.der.decoder import decode
from pyasn1.error import PyAsn1Error
import OpenSSL
-DEFAULT_EXP = 157680000 # = 24 * 60 * 60 * 365 * 5
+# Default expiry must not be too long: https://github.com/mitmproxy/mitmproxy/issues/815
+DEFAULT_EXP = 94608000 # = 24 * 60 * 60 * 365 * 3
# Generated with "openssl dhparam". It's too slow to generate this on startup.
DEFAULT_DHPARAM = b"""
-----BEGIN DH PARAMETERS-----