Turns out that this failure occurs when Gajim can't import the pyasn1 package. So, it looks like the bug could be solved by telling the user the real problem, rather than claiming that the server certificate is bad.
Turns out that this failure occurs when Gajim can't import the pyasn1 package. So, it looks like the bug could be solved by telling the user the real problem, rather than claiming that the server certificate is bad.