How to resolve "The server is unavailable and could not be accessed. The server is probably disconnected from the network." error in Sharepoint serach crawl.

Hi all,
I have created a content source in Search service application for a particular site collection "http://spwebapp/sites".
I performed reset crawl index of Search service application and then performed a full crawl.
But i get errors on running crawl on this content source for most of the files. The error is "The server is unavailable and could not be accessed. The server is probably disconnected from the network." Though the site is accessible.
But before performing reset index the crawl was working fine on this content source. Crawl is working fine for other site collections. Only one site collection is facing this problem. Please let me know if what I can do to resolve this error.
Thanks in advance.

Are you seeing any error messages in the URL related to the Gatherer? And in your content source, are there any site URLs that are no longer active or do you have any crawl rules set up that might be affecting access to the site collection?
I've seen this happen for a variety of reason, SSL issues, proxy issues, permissions issues. The Eventvwr and ULS logs should help you narrow down the real problem.
Sometimes this is an issue because the indexer and the site are sitting on the same box, you could try doing a disable loopback check to see if that resolves the issue and if it does then go through the hassle of setting up a specific LSA :
http://iedaddy.com/2009/04/sharepointdisable-loopback-check/
ieDaddy
Blog: http://iedaddy.com
Twit: @iedaddy

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The server is unavailable and could not be accessed

Hello,
Our SharePoint Search stopped working on the weekend, and I still could not figure out the problem. I checked Event Viewer, and ULS Logs, they are all pointing to network issue. However, I can ping the web servers from application servers.
It does not navigate to SharePoint site though. I'm not sure what would be the problem. I read that it could be Kerberos, but it was working without any problems for a long time.
Can anyone help me please?
Context: Application 'Search_Service_Application_1', Catalog 'Portal_Content'
Details:
   The server is unavailable and could not be accessed. The server is probably disconnected from the network.   (0x80040d32)
The server xxxx is unavailable and could not be accessed. The server is probably disconnected from the network. Items from this server will be skipped by the crawl for the next 10 minutes
Thanks

Hi Danny:
I provide you three method for you, maybe you can try it.
Method 1 (recommended): Create the Local Security Authority host names that can be referenced in an NTLM authentication request.
To do this, follow these steps for all the nodes on the client computer:
Click Start, click Run, type regedit, and then click
OK.
Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0
Right-click MSV1_0, point to New, and then click
Multi-String Value.
In the Name column, type BackConnectionHostNames, and then press ENTER.
Right-click BackConnectionHostNames, and then click
Modify.
In the Value data box, type the CNAME or the DNS alias, that is used for the local shares on the computer, and then click
OK.
Exit Registry Editor, and then restart the computer.
Note Type each host name on a separate line.
Note If the BackConnectionHostNames registry entry exists as a REG_DWORD type, you have to delete the BackConnectionHostNames registry entry.
Method 2: Disable the authentication loopback check
Re-enable the behavior that exists in Windows Server 2003 by setting the DisableLoopbackCheck registry entry in the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa registry subkey to 1. To set the DisableLoopbackCheck registry entry
to 1, follow these steps on the client computer:
Click Start, click Run, type regedit, and then click
OK.
Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
Right-click Lsa, point to New, and then click
DWORD Value.
Type DisableLoopbackCheck, and then press ENTER.
Right-click DisableLoopbackCheck, and then click Modify.
In the Value data box, type 1, and then click
OK.
Exit Registry Editor.
Restart the computer.
Method 3: Check the hosts file
Remove sharepoint search server record.

Search Server is unavailable and could not be accessed While crawling .zip files

I Have Search Service Application running in one of the Application Server in my Farm. I am using Continuous Crawl to Crawl My Local SharePoint Site Content Source. Today I looked at SearchServiceApp:CrawlLog-URl page and Found out following error message
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Hi octopus,
According to your description, my understanding is that you got an error when you crawl zip files in SharePoint 2010.
Whether this error occurred for all zip files in the entrie farm.
Please disable the authentication loopback, then do a full crawl, compare the result.
For disabling the authentication loopback, you can do as the followings:
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
Right-click Lsa, point to New, and then click DWORD Value.
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Here are two similar posts for your reference:
http://sharepoint-kit.blogspot.jp/2013_08_01_archive.html
http://suryapulipati.blogspot.jp/2013/10/the-sharepoint-item-being-crawled.html
If this issue still exists, please check the log file to find more information about this issue. The path of the log file is: C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\LOGS.
I hope this helps.
Thanks,
Wendy
Wendy Li
TechNet Community Support

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How to resolve "The server is unavailable and could not be accessed. The server is probably disconnected from the network." error in Sharepoint serach crawl.

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