Try this:
Code:
zimbra@mail:~$ zmprov gs mail.blah.com | grep Port
zimbraAdminPort: 7071
zimbraImapBindPort: 143
zimbraImapProxyBindPort: 7143
zimbraImapSSLBindPort: 993
zimbraImapSSLProxyBindPort: 7993
zimbraLmtpBindPort: 7025
zimbraMailPort: 81
zimbraMailProxyPort: 8080
zimbraMailSSLPort: 444
zimbraMailSSLProxyPort: 8443
zimbraMemcachedBindPort: 11211
zimbraNotifyBindPort: 7035
zimbraNotifySSLBindPort: 7036
zimbraPop3BindPort: 110
zimbraPop3ProxyBindPort: 7110
zimbraPop3SSLBindPort: 995
zimbraPop3SSLProxyBindPort: 7995
zimbraRemoteManagementPort: 22
zimbraSmtpPort: 25
zmprov ms mail.blah.com zimbraAdminPort 55555
...then .. used to be tomcat you'd restart. There should be something you restart without having to restart all of zimbra.