搬瓦工日本软银限量版方案对联通非常友好，丢包率极低，电信和移动晚上丢包较多，不适合建站。一般认为可以选择升级到线路更稳定的CN2 GIA套餐，迁移到DC9和DC6机房。
不过我最近遇到一件奇怪的事情，升级到LOS ANGELES - CN2 GIA ECOMMERCE169美元套餐后，发现无法迁移机房，显示报错：Migration backend is currently not available for this VPS. Please try again in 10-15 minutes. (734152)。
734152报错有两种原因：一个是IP被墙，另一个就是搬瓦工后台系统问题。经过多次测试未果，发工单咨询，得到回复说是IP被墙。
回复内容如下：
Hello,
Looks like the IP is blocked by GFW. While the IP is on any other major block list (Spamhaus, Barracuda, GFW etc), the VPS stays fully operational. However you will not be able to migrate the VPS to a different datacenter until the block is removed.
Here is how to manually verify if your VPS IP is being blocked by the Great Firewall of China:
1. Navigate to http://port.ping.pe
2. Enter your VPS IP and SSH port in the top field, like this: 1.2.3.4:22222
3. Click 'Go'The service will attempt to connect to your SSH port from multiple countries and in case of a banned IP will show that the port is closed when attempting from China (but not other countries).
*** Possible solutions ***
We found that generally GFW automatically removes the ban when it can no longer detect the 'prohibited' service for a few days to few weeks. The best solution in the case of a ban would be the complete removal of all service(s) that could trigger the ban and waiting for some time for the ban to be lifted.
Having said that, please do keep in mind that we do not have any control over GFW, and we do not know much about how it works. It is our responsibility to make sure our hardware and network stay fully operational, and GFW-related issues are out of scope of our competence.
If you need to replace a banned IP with a clean IP, we offer this service at the following link:
https://bandwagonhost.com/ipchange.php
mirror:
https://bwh81.net/ipchange.php
This is an automatic reply. If your request was not properly addressed, please reply in this ticket and one of our engineers will take a look.
简单意思就是：该IP的:22222端口被GFW封，进了黑名单，如果要迁移机房，需要重新购买。
经过测试后，发现该IP在国内和国外可以ping通，SSH Port也可以ping通，22222端口不通。我的一个站点放在搬瓦工日本软银限量版方案，中国大陆可以正常访问。
造成这种情况原因是什么，我请教一些运营主机的朋友，都不得要领，只能说各个机房的限制不同。
这里要提醒手中有搬瓦工日本软银限量版方案的用户，建议ping下22222端口，看是否可以ping通，因为软银不可以迁移机房，所以保不齐IP哪个端口被墙，所以还是断了升级的念想。
我已经发起PayPal争端，要求退回已经支付的升级费用。搬瓦工规矩多大家都知道，但是这种问题的确很奇葩，工单响应非常慢，又不解决问题。目前PayPal已经升级争端，随后更新一下处理进度。
这可能是最后一次使用搬瓦工了，服务质量和TOS规则需要调整了。别了，搬瓦工。