[Twisted-Python] Weird SSL/TLS issue

Jason J. W. Williams jasonjwwilliams at gmail.com
Thu Dec 27 14:23:58 EST 2012

We have an application that uses Twisted Web to listen for an API call and
when it receives it, the app then connects over SMTP to the specified mail
server IP and validates whether the indicated user exists. The app has been
running without issue or modification for close to 2 years (uses Twisted
10.2.0). Then suddenly last night it started being unable to find the
starttls() method on the Connection object when negotiating with any mail


We were able to replicate the problem consistently, and determine it was
not a network issue. The weird part is that simply restarting the
application cleared the issue and TLS SMTP connections were able to be made
again. Since the Twisted modules were loaded at startup, I'm a little
confused on how it suddenly decided  the TLS methods were missing until we

Any ideas are greatly appreciated.

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