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I'm trying to connect to an SQL Anywhere database on the network.

Any help is appreciated.


Here is the connections string:


Here is the error I'm getting.

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************** Exception Text **************
System.Data.OleDb.OleDbException (0x80040E4D): Connection error: Found server but communication error occurred
at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)
at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)

asked 02 Oct '11, 11:50

tspree15's gravatar image

accept rate: 0%

edited 03 Oct '11, 07:27

Volker%20Barth's gravatar image

Volker Barth

(02 Oct '11, 15:52) Breck Carter

You should be able to feed the connection string to the SAConnection class (which is a spezialized type of the generic .Net DBConnection class), either as a common connetion string, or with the help of the SAConnectionStringBuilder class.

I haven't used this myself, but the handling seems quite easy...look at that doc page.

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answered 03 Oct '11, 07:26

Volker%20Barth's gravatar image

Volker Barth
accept rate: 34%

Generically, "Connection error: Found server but communication error occurred" means just what the message implies - the connection library was able to find the targeted server name via UDP broadcasting (e.g. "sqlmicros1"), but couldn't make an active TCP connection to it (over "").

Are you sure that the "sqlmicros1" database server is running on that IP/port? Can you check dblocate to see if it can see this server as well? Can you add the connection option "LOG=c:\connlog.txt" to the connection string, and review the resulting log to check how the client is attempting to contact this server?

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answered 04 Oct '11, 13:52

Jeff%20Albion's gravatar image

Jeff Albion
accept rate: 25%

edited 04 Oct '11, 13:52

Try using DbConnection, it's better than OLEDB.

I'm presuming that you are using .net .


sample connectionString="uid=DBA;pwd=sql;ServerName=DemoDB;links=tcpip(;port=5577)"

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answered 02 Oct '11, 21:55

Zote's gravatar image

accept rate: 43%

edited 03 Oct '11, 15:37


Yes, I am using .net. Any chance you can provide the connection string using DbConnection?



(02 Oct '11, 22:19) tspree15
Replies hidden

see my response again :p

(03 Oct '11, 15:37) Zote

Why are you specifying a connection name ("CON=SQL_DBC_190f07d8"), especially one which looks very similar to the names generated automatically?

If a connection with that name already exists, you are creating your own conflict in naming.

Try omitting the CON= parameter and see if your problem goes away with it.

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answered 04 Oct '11, 10:48

William%20Clardy's gravatar image

William Clardy
accept rate: 0%

edited 04 Oct '11, 10:48


AFAIK there's no rule against duplicate connection names, and SQL Anywhere certainly doesn't check for uniqueness. Maybe some application or other might get confused if it's expecting uniqueness but that would not explain the symptom here... IMO anyway. FWIW I just successfully created 10 dbisql sessions all with CON=SQL_DBC_190f07d8... the title bars all say exactly the same thing "SQL_DBC_190f07d8 - Interactive SQL"

(04 Oct '11, 11:55) Breck Carter

Dang, putting my ignorance out there is getting educational!

I never realized that the connection names aren't unique. That is interesting -- not terribly useful, but definitely interesting in a "I wouldn't do it that way" sense.

Thank you for the correction, Breck.

(04 Oct '11, 13:17) William Clardy

May this be related to .NET Connection pooling?

Once you have tried to use the native SQL Anywhere data provider (see my other answer), you might try whether the enabling/disabling of connection pooling will have an influence.

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answered 04 Oct '11, 12:23

Volker%20Barth's gravatar image

Volker Barth
accept rate: 34%

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question asked: 02 Oct '11, 11:50

question was seen: 8,352 times

last updated: 04 Oct '11, 13:52