From 5220451b7302fe98c2234ceaa08dbbc5040c8c94 Mon Sep 17 00:00:00 2001
From: SomberNight <somber.night@protonmail.com>
Date: Fri, 22 Jun 2018 18:01:55 +0200
Subject: [PATCH] fix #4457

---
 lib/interface.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/interface.py b/lib/interface.py
index e4fcb2b5d..dbd41a0db 100644
--- a/lib/interface.py
+++ b/lib/interface.py
@@ -149,7 +149,11 @@ class TcpConnection(threading.Thread, util.PrintError):
                 except:
                     return
 
-                if s and self.check_host_name(s.getpeercert(), self.host):
+                try:
+                    peer_cert = s.getpeercert()
+                except OSError:
+                    return
+                if s and self.check_host_name(peer_cert, self.host):
                     self.print_error("SSL certificate signed by CA")
                     return s
                 # get server certificate.
@@ -166,7 +170,10 @@ class TcpConnection(threading.Thread, util.PrintError):
                 except:
                     return
 
-                dercert = s.getpeercert(True)
+                try:
+                    dercert = s.getpeercert(True)
+                except OSError:
+                    return
                 s.close()
                 cert = ssl.DER_cert_to_PEM_cert(dercert)
                 # workaround android bug