问题
当尝试升级时,我为什么收到以下错误:
Failure downloading upgrade list. (Error performing upgrade: I/O error).
Errors when trying to upgrade. Failure downloading upgrade list.
(Error performing upgrade: I/O error opening URL '<download URL>')?
有一些个原因为什么此错误可能出现:
- 无法通过DNS (可能负缓存条目)解决升级服务器主机名
- 升级使用的接口不能通信到升级服务器。
请参阅解决方案关于下面每个方案。
无法解决升级服务器DNS (可能负缓存条目)
要验证,如果坏DNS导致问题,请运行以下CLI命令:
WSA.CLI > nslookup downloads.ironport.com
如果没有返回的相关的IP地址,请运行dnsflush命令。这将强制升级服务器的WSA再请求DNS。
Is 'nslookup' of the domain "downloads.ironport.com" successful on the WSA?
-------------------------------------------------------------------------------------
- 在这种情况下,为什么将推荐尝试另一个DNS服务器或检查
不解决已配置的DNS的serveris思科的更新服务器的主机名
- 如果是,然后使用CLI命令“dnsflush”淹没DNS缓存&强制DNS查找
WSA.CLI> dnsflush
Are you sure you want to clear out the DNS cache? [N]> y
upgrade命令可能成功当前运行。
检查CLI命令“升级”是否返回错误。
wsa.example.com (SERVICE)> upgrade
Failure downloading upgrade list. (Error performing upgrade: I/O error
opening URL
'http://downloads.ironport.com/asyncos/upgrade/?serial=<Serial_Number>
&version=<AsyncOS-version>&product=<WSA-Model>')
wsa.example.com (SERVICE)> nslookup downloads.ironport.com
A=64.62.193.129 TTL=30m
A=64.62.193.134 TTL=30m
wsa.example.com (SERVICE)> dnsflush
Are you sure you want to clear out the DNS cache? [N]> y
wsa.example.com (SERVICE)>
wsa.example.com (SERVICE)> upgrade
Upgrades available:
1. AsyncOS 7.5.2 build 303 upgrade For Web .....
[1]>
The interface being used for upgrades cannot communicate to the
upgrades server
如果不正确的接口使用升级,此错误可能也返回。
当M1和P1接口根据网络部署时使用,很可能,仅P1接口访问互联网访问,并且应该是正确接口使用升级。如果WSA配置在这些情况下使用M1,则可能造成升级取指令失效,造成“失败下载…”错误。
这是更改的升级接口说明通过CLI :
WSA.CLI> updateconfig
Upgrade source: http://downloads.qa/asyncos/upgrade/
Upgrade interface: AUTO
Proxy server: not in use
Choose the operation you want to perform:
- SETUP - Edit upgrade configuration.
[]> setup
Please select the upgrade source you want to use for AsyncOS updates:
1. Use Cisco update servers
2. Use own server
[1]> <Enter>
.......
Choose the routing table to use
1. Data
2. Management
[1]> 1
..... Press <Enter> till you reach the CLI prompt ......
WSA.CLI> commit
Note:请注意:,除非‘进行’发出,上述更改不会生效。