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Lync Control Panel 404.4 Error

I have Lync Server 2013 running on Server 2012 R2. All of a sudden the Lync Server Control Panel isn't loading anymore. Attached is an image of the errorLync-Error.PNGI am getting HTTP Error 404.4-Not Found page.
Detailed Error Information
Notification:MapRequestHandler
Handler: not yet determined
Error Code: 0x8007007b.

I have been able to log in just fine in the past but when I tried the other day I am getting the error. I have verified that Lync is 100% up to date as of now. I looked through the event log and haven't found anything that would point to an error. I'm sure it is a setting somewhere in IIS but I cannot find where. Someone please help
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Chris Nelson
Asked:
Chris Nelson
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3 Solutions
 
Mohammed HamadaSenior IT ConsultantCommented:
On front end if you open the following url would it work?
https://localhost/cscp 

try that and see if u get the same error?
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Chris NelsonAuthor Commented:
When I try to load https://localhost/cscp on the local server I do receive the same error page.
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Mohammed HamadaSenior IT ConsultantCommented:
When you open IIS.. can you check if CSCP virtual directory exists or not?
Also open event viewer and check under the Lync logs if there any recent errors .. please post their event numbers here for the last 10 error events
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Chris NelsonAuthor Commented:
Attached is the event viewer and IIS showing CSCP. The error in event viewer appears to be a different error and is going back to when the control panel was last working
CSP.PNGEvent-Viewer.PNG
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Mohammed HamadaSenior IT ConsultantCommented:
Have you recently installed any Cumulative update?
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Chris NelsonAuthor Commented:
Any updates that I would of installed would have been from Windows update, so I may have
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Chris NelsonAuthor Commented:
I looked up the error and ran the following powershell command:

Install-CsDatabase -ConfiguredDatabases -SqlServerFqdn frontendserver.fqdn -Verbose

I am no longer getting all the event log errors, however I am still getting the 404.4 error trying to load the Lync Control Panel
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Mohammed HamadaSenior IT ConsultantCommented:
try IIS reset on CMD .. also run Lync Deployment wizard - Setup or Remove components.. see if things gets improved?
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Chris NelsonAuthor Commented:
I ran IISReset and The  Lync Deployment wizard - Setup or Remove components and I am still getting the same error
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Mohammed HamadaSenior IT ConsultantCommented:
Have you assigned a certificate ?? Can you please post a screenshot of your IIS binding of the port 443?

Also on CMD run the following commands and post the result here

Netstat -anbo >ports.txt    Enter
notepad ports.txt     Enter

Post the ports result here.
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Chris NelsonAuthor Commented:
Yes I have a certificate assigned. Where do I pull the screenshot for the IIS bindings of port 443?

So a little history on what may of broken the control panel, I was trying to get lync to work on mobile internally only. I don't care about it working outside of my company only internally on our wireless. In trying to set it up I was attempting to setup a reverse proxy in IIS. I ended up getting other errors so I removed all the settings I changed and this is when I noticed that the control panel wasn't working. Not sure if control panel had been offline before this or if my changes effected something somewhere.
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Chris NelsonAuthor Commented:
Attached is the IIS binding for port 443IIS-Binding.PNG
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Chris NelsonAuthor Commented:
I finally fixed it! Here's what I ended up doing.

I removed IIS rewrite 2.0 module from add/remove programs

Then I re-ran the lync deployment wizard Setup or Remove components and everything is working again!

Not sure if you'll know how to get lync mobile to work internally or not by chance? I can open another thread and can try and work on that. I'm just afraid whatever I did trying to get it to work in the first place will break lync control panel again
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Mohammed HamadaSenior IT ConsultantCommented:
IIS rewrite 2 is normally not installed on Lync front end as far as I can remember. it's installed on the IIS ARR server which is considered a reverse proxy for lync's mobility feature.
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Chris NelsonAuthor Commented:
I was able to google more into the issue and found the solution but with assistance from Mohammed
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