<p>Beberapa hari yang lalu, saya melakukan pekerjaan upgrade Zimbra dari versi Open Source Edition menjadi Network Edition 8.8.15 di salah satu klien. Salah satu keunggulan dari Zimbra Network Edition yaitu adanya menu Zimbra Network yang berisi fitur-fitur Zimbra NE antara lain Backup, Admin Delegation, Mobile Sync, HSM dan Talk seperti tampilan berikut ini.</p>
<p><img data-attachment-id="1551" data-permalink="https://rizkypratama.id/blog/2019/09/12/memperbaiki-zimbra-network-zextras-cannot-communicate-with-the-server/fitur-zimbra-network/" data-orig-file="https://i0.wp.com/rizkypratama.id/wp-content/uploads/2019/09/fitur-zimbra-network.png?fit=930%2C635&;ssl=1" data-orig-size="930,635" data-comments-opened="1" data-image-meta="{";aperture";:";0";,";credit";:";";,";camera";:";";,";caption";:";";,";created_timestamp";:";0";,";copyright";:";";,";focal_length";:";0";,";iso";:";0";,";shutter_speed";:";0";,";title";:";";,";orientation";:";0";}" data-image-title="fitur-zimbra-network" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/rizkypratama.id/wp-content/uploads/2019/09/fitur-zimbra-network.png?fit=300%2C205&;ssl=1" data-large-file="https://i0.wp.com/rizkypratama.id/wp-content/uploads/2019/09/fitur-zimbra-network.png?fit=810%2C553&;ssl=1" class="aligncenter wp-image-1551 " src="https://rizkypratama.id/wp-content/uploads/2019/09/fitur-zimbra-network.png" alt="" width="666" height="455" /></p>
<p>Saat itu proses upgrade menjadi Zimbra NE berjalan lancar, namun hingga saat nya pengecekan setelah upgrade, ketika akses Zimbra Admin, muncul pop up dengan pesan error &#8220;Zextras Error: Cannot communicate with the server&#8221;</p>
<p><img data-attachment-id="1552" data-permalink="https://rizkypratama.id/blog/2019/09/12/memperbaiki-zimbra-network-zextras-cannot-communicate-with-the-server/zextras_cannot_communicate_with_server_2/" data-orig-file="https://i0.wp.com/rizkypratama.id/wp-content/uploads/2019/09/zextras_cannot_communicate_with_server_2.png?fit=419%2C214&;ssl=1" data-orig-size="419,214" data-comments-opened="1" data-image-meta="{";aperture";:";0";,";credit";:";";,";camera";:";";,";caption";:";";,";created_timestamp";:";0";,";copyright";:";";,";focal_length";:";0";,";iso";:";0";,";shutter_speed";:";0";,";title";:";";,";orientation";:";0";}" data-image-title="zextras_cannot_communicate_with_server_2" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/rizkypratama.id/wp-content/uploads/2019/09/zextras_cannot_communicate_with_server_2.png?fit=300%2C153&;ssl=1" data-large-file="https://i0.wp.com/rizkypratama.id/wp-content/uploads/2019/09/zextras_cannot_communicate_with_server_2.png?fit=419%2C214&;ssl=1" class="aligncenter wp-image-1552 size-full" src="https://rizkypratama.id/wp-content/uploads/2019/09/zextras_cannot_communicate_with_server_2.png" alt="" width="419" height="214" /></p>
<p>Setelah dilakukan pengecekan pada log zmmailboxd.out, ditemukan adanya indikasi DOS dari IP yang akses Zimbra Admin tersebut, berikut ini contoh log nya</p>
<pre>2019-09-05 09:57:46.025:WARN:oejs.DoSFilter:qtp2044215423-91:https://192.168.8.32:7071/service/admin/soap/BackupQueryRequest: DOS ALERT: Request rejected ip=192.168.70.12, session=null, user=null 
2019-09-05 09:57:46.032:WARN:oejs.DoSFilter:qtp2044215423-86:https://192.168.8.32:7071/service/zimlet/com_zextras_zextras/img/dwt.png: DOS ALERT: Request rejected ip=192.168.70.12, session=null, user=null 
2019-09-05 09:57:46.055:WARN:oejs.DoSFilter:qtp2044215423-92:https://192.168.8.32:7071/service/admin/soap/GetMailQueueInfoRequest: DOS ALERT: Request rejected ip=192.168.70.12, session=null, user=null 
</pre>
<p>Dari pesan log diatas, IP 192.168.70.12 merupakan IP yang akses Zimbra Admin, kemudian IP 192.168.8.32 merupakan IP server Zimbranya. Kemudian untuk mengatasi permasalahan tersebut, berikut ini langkah-langkahnya :</p>
<pre>su - zimbra 
zmprov mcf zimbraHttpDosFilterMaxRequestsPerSec 100 
zmprov mcf +zimbraMailTrustedIP 127.0.0.1 +zimbraMailTrustedIP 192.168.8.32 
zmprov mcf +zimbraHttpThrottleSafeIPs 192.168.70.12 
zmmailboxdctl restart 
</pre>
<p>Note : Jika menggunakan skema multi server, command diatas dijalankan pada server mailbox, dan pada command +zimbraMailTrustedIP, silakan masukkan seluruh IP Zimbra proxy</p>
<p><strong>Baca juga : <a href="https://rizkypratama.id/blog/2021/09/11/mengatasi-timestamp-mailbox-log-zimbra-tidak-sesuai-timezone/" target="_blank" rel="noopener">Mengatasi timestamp mailbox.log Zimbra tidak Sesuai TimeZone</a></strong></p>
<p>Kalau sudah selesai proses restart service mailbox, silakan akses kembali Zimbra Admin dan cek kembali menu Zimbra Network, semestinya sudah tidak muncul kembali pop error yang sebelumnya</p>
<p>Mungkin cukup sekian, semoga bermanfaat</p>
<p>Tambahan, jika rekan-rekan ada yang membutuhkan jasa Implementasi Zimbra, Upgrade Zimbra dan Professional Services Mengenai Zimbra, jangan ragu untuk hubungi kami di <a href="https://www.excellent.co.id/kontak/" target="_blank" rel="noopener noreferrer">https://www.excellent.co.id/kontak/</a></p>
<div class="saboxplugin-wrap" itemtype="http://schema.org/Person" itemscope itemprop="author"><div class="saboxplugin-tab"><div class="saboxplugin-gravatar"><img src="https://rizkypratama.id/wp-content/uploads/2020/09/My-Photos.jpg" width="100" height="100" alt="My Photos" itemprop="image"></div><div class="saboxplugin-authorname"><a href="https://rizkypratama.id/blog/author/rizky/" class="vcard author" rel="author"><span class="fn">Rizky Pratama</span></a></div><div class="saboxplugin-desc"><div itemprop="description"><p>Rizky Pratama. Tinggal di Bekasi, Jawa Barat. Seorang IT di salah satu perusahaan IT. Pengguna Mac, Linux dan Windows<br />
Selain sebagai penulis di blog ini, saya juga penulis di blog saya yang lain, yaitu <a href="https://pratama.biz.id" target="_blank" rel="noopener noreferrer">https://pratama.biz.id</a></p>
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