'Sys' is undefined....

Question

User-2050755205 posted

Ok after banging my head against a wall many many times I figured out this issue.

'Sys' is undefined means that the Ajax dll can't find the java scripts it needs to run.

In my case it was due to a bad SSL cert on the server, if I went to any of the pages via http "unsecure" it would work but if a page was behind https: "secure" it would throw a 'Sys' is undefined.

I  learned this after multiple reconfigurations of the web.config changing dll versions from 1.0 to 3.5 etc.

Also tried loading the java scripts on the page after ajax fired etc.

So if you have triple checked everything double check that if it's on a secure page and try a page with ajax on it that isn't secure and see if the 'Sys' is undefined error pops up or not.

Answer 1

User-448512826 posted

Hi,

http://weblogs.asp.net/chrisri/archive/2007/02/02/demystifying-sys-is-undefined.aspx

http://forums.asp.net/t/1040236.aspx/1

Thanks..

Answer 2

User555306248 posted

Hi,

There are lots of scenarios bing on the 'sys' error.

You can check these thread:

http://forums.asp.net/p/1209962/2132128.aspx#2132128  Generally speaking, the sys problem should be resolved by using this appraoch.

http://encosia.com/updated-your-webconfig-but-sys-is-still-undefined/

If not, you can check this sys problem FAQ thread:

Getting error while running Ajax application. Error:'Sys' is undefined.