sql server - Intermittent database connection issue but only with certain sites -


i have freaky issue i'm struggling find solution to.

i have windows 2012 web server , separate windows 2012 server running sql server 2012. installed.

the servers have 2 network cards - 1 public other direct connection between two.

i have number of database driven websites on web server. connecting same database , in many case using identical connection string.

my code asp , in cases using connection string:

mydbconn_string = "provider=sqloledb; network library=dbmssocn; data source=169.254.210.158; initial catalog=mydatabase; user id=database_user; password=mypassword"

this works fine. indeed had been running , working fine few days.

when start seeing these errors in logs:

[dbnetlib][connectionopen (connect()).]specified sql server not found.. .

re-starting server fixes problem involves downtime , hardly viable solution.

what odd although websites using same connection string - 1 website suffered issue - others continued connect fine.

and website have issues has no problems server pages - public connection appears fine - unable connect database server via tcp ip.

all sites set similar configurations - largely default.

each has own application pool.

so far not happening server has been live 2 days - once in 2 days far.

i've searched internet solutions not common issue!

can help?


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