diff --git a/src/Sonarr.Api.V3/Config/HostConfigModule.cs b/src/Sonarr.Api.V3/Config/HostConfigModule.cs
index 121449649..eb9021929 100644
--- a/src/Sonarr.Api.V3/Config/HostConfigModule.cs
+++ b/src/Sonarr.Api.V3/Config/HostConfigModule.cs
@@ -43,6 +43,7 @@ namespace Sonarr.Api.V3.Config
             SharedValidator.RuleFor(c => c.Password).NotEmpty().When(c => c.AuthenticationMethod != AuthenticationType.None);
 
             SharedValidator.RuleFor(c => c.SslPort).ValidPort().When(c => c.EnableSsl);
+            SharedValidator.RuleFor(c => c.SslPort).NotEqual(c => c.Port).When(c => c.EnableSsl);
             SharedValidator.RuleFor(c => c.SslCertHash).NotEmpty().When(c => c.EnableSsl && OsInfo.IsWindows);
 
             SharedValidator.RuleFor(c => c.Branch).NotEmpty().WithMessage("Branch name is required, 'master' is the default");