Exception thrown while enumerating UserProfileManager for user profile

Question

Hello All,
We have a SharePoint 2010 Timer Job in which access User Profile Service Application and update user profile properties of some the users. This user profiles is synched with AD. 
We have following lines of code here:
SPServiceContext context =
SPServiceContext.GetContext(site);
UserProfileManager profileManager =
new UserProfileManager(context);
int
count = profileManager.Count
//This line works OK
foreach (UserProfile userProfile
in profileManager) //This throws exception at first loop
When we start looping through the
UserProfileManager instance in above lines of code it throws following exception:
System.TimeoutException at Microsoft.Office.Server.UserProfiles.ProfileDBCacheServiceClient.GetUserData(UserSearchCriteria searchCriteria)
   at Microsoft.Office.Server.UserProfiles.UserProfileCache.GetBulkUserProfiles(UserProfileManager objManager, String searchColumn, IList searchList, Boolean includeNullsForUnresolvableUsers, Int64& lFailedCount)
   at Microsoft.Office.Server.UserProfiles.UserProfileCache.GetBulkUserProfiles(UserProfileManager objManager, List`1 userIdList, Boolean includeNullsForUnresolvableUsers, Int64& lFailedCount)
   at Microsoft.Office.Server.UserProfiles.ProfileEnumerator`1.PopulateUserProfileQueue(IList userSearchList)
   at Microsoft.Office.Server.UserProfiles.ProfileEnumerator`1.PopulateQueue()
   at Microsoft.Office.Server.UserProfiles.ProfileEnumerator`1.MoveNext()
One point to note here is that we have almost 50,000 user profiles in total. This exception is thrown intermittently, I mean in the last 10 days it has happened thrice.
It will be great if someone can help me out on this. Please let me know if any additional  information is required.
Thanks

Answer 1

Hi,
As I understand, you encountered User Profile time out issue.
First of all, please confirm that related service and service application are at started status on all servers.
User Profile time out issue might be caused by several reasons, as you said the issue is generated intermittently, there might be networking issue as well. So please check ULS log for related error message.
Similar issue:
http://wingleungchan.blogspot.com/2012/11/userprofileapplicationnotavailableexcep.html
Regards,
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