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Users cannot get to Websphere hosted pages via IIS 6 - Could not write headers error.

Posted on 2006-07-13
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Hi,
We have IIS 6 on the same server as Websphere 5.0.2.5 along with the generated plugin.  I enabled trace logging and monitored a page request.  Everything seems ok except the following error message shows up in the http_plugin.log file when a page is requested.

[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - TRACE: ESI: esiResponseCreate: no Surrogate-Control header found
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - TRACE: ESI: esiResponseCreate: bypassing ESI
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - TRACE: ESI: esiResponseGet: success
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - TRACE: ESI: esiResponsePassThru
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - TRACE: iis_plugin: cb_write_headers: In the write headers callback
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - TRACE: iis_plugin: getServerVariable: Getting server variable: SERVER_PROTOCOL
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - WARNING: iis_plugin: cb_write_headers: Could not write headers, OS err: 10054
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - ERROR: ESI: esiResponsePassThru: failed to write headers: rc = 7
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - TRACE: ESI: esiRequestUrlStackDestroy

I have searched the web for the "failed to write headers" error but can not find a solution!  I am fairly certain that IIS is configured properly, could this be a security setting?  I have been down that road quite often also....

Thanks...
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Question by:threed45
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Waswiz earned 2000 total points
ID: 17210636
This is some what long shot but it might just help you.

See the errors:

[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - TRACE: iis_plugin: getServerVariable: Getting server variable: SERVER_PROTOCOL
[Thu Jul 13 13:35:48 2006] 000006fc 00001448 - WARNING: iis_plugin: cb_write_headers: Could not write headers, OS err: 10054

I think there was error when the WebSphere plugin calls "getServerVariable" , the header variable used is "SERVER_PROTOCOL"

I remember we had similar problem with IIS integration with other products. As far as I can remember IIS can be configured to name these variables with underscore and without underscore say for example "SERVERPROTOCOL" as against "SERVER_PROTOCOL".

Use any http tracing tool and check the headers and I guess there is a header name mismatch.

We definitely had this issue before and vendor gave a fix so that it checks for both.

Hope this helps.
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by:Waswiz
ID: 17621778
We have had exact similar problem and we had fixed it using the solution I suggested.
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