Sometime you will get this error "svn: OPTIONS of 'https://1.1.1.1/svn/xxx': Server certificate verification failed: issuer is not trusted (https://1.1.1.1)" when setting svn (source control) on Coda.

The solution is so easy to solve.

Open your terminal -> type " svn list yourservername", e.g. " svn list https://1.1.1.1", then will show that notification

Certificate information:
 - Hostname: 1.1.1.1
 - Valid: from Tue, 28 Jun 2011 02:36:55 GMT until Wed, 27 Jun 2012 02:36:55 GMT
 - Issuer: Taipei, Taiwan, TW, RD, ???
 - Fingerprint: XXX(ignore that)
(R)eject, accept (t)emporarily or accept (p)ermanently? p

choose 'p' to authenticate this certificate on your computer permanently.
Back to your coda reconnect successfully.