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Mphstart does not work even the comsolserver is running (Comsol 4.4)

Posted Apr 4, 2014, 5:08 a.m. EDT LiveLink for MATLAB Version 4.4 10 Replies

Dong Liu
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I installed the latest ver. 4.4 and I found the command "mphstart" did not work when I wanted to connect my Matlab to the comsolserver. I am sure the comsolserver was already running prior to the command "mphstart" was excuted in my M-file. The error shows "Error using mphstart (line 152) A connection to Comsol could not be established .... Please check that a Comsol Server is started prior to calling mphstart ". I am also sure the folder 'mli' had already been added to the Matlab path.
Even though I ran "COMSOL 4.4 with MATLAB" and managed to establish the connection, when I type "mphstart" again in the Matlab command line, the same error occured.
This did not happen to 4.3a and 4.3b at all.
So anyone could tell me how to solve this problem?
(the version was already updated to 4.4 build 195)
10 Replies Last Post Nov 19, 2015, 10:47 a.m. EST
COMSOL Moderator

Hello Dong Liu

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Monika Wiebe
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Posted: 1 decade ago May 23, 2014, 7:41 a.m. EDT
I've got the same problem, have you found a solution yet?
I've got the same problem, have you found a solution yet?
Monika Wiebe
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Posted: 1 decade ago May 23, 2014, 9:06 a.m. EDT
I'm using COMSOL4.4 and Matlab 2007b by the way, maybe there's aproblem with the version?
I'm using COMSOL4.4 and Matlab 2007b by the way, maybe there's aproblem with the version?
Floris van Kempen
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Posted: 1 decade ago Jul 29, 2014, 11:17 a.m. EDT
Same problem here. Have you found a solution?

I tried it with comsol 4.4, both version 195 and 248 and tried it with Matlab 2012b and 2014a, and, it doesn't work on multiple PCs. The shortcut Comsol 4.4 with matlab does function properly, but I cannot use that on our remote machine. Also Comsol 4.3b connects without any problem using mphstart.

The comsol server console doesn't show any evidence of a connection being attempted. But the port is open according to "netstat -a".

No luck yet.
Same problem here. Have you found a solution? I tried it with comsol 4.4, both version 195 and 248 and tried it with Matlab 2012b and 2014a, and, it doesn't work on multiple PCs. The shortcut Comsol 4.4 with matlab does function properly, but I cannot use that on our remote machine. Also Comsol 4.3b connects without any problem using mphstart. The comsol server console doesn't show any evidence of a connection being attempted. But the port is open according to "netstat -a". No luck yet.
Monika Wiebe
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Posted: 1 decade ago Jul 31, 2014, 2:15 a.m. EDT
No, I did not find a solution. In the end, I just decided not to use the Matlab connection. I suspected it was because of my MATLAB version, someone else started it with a newer version an another PC and it worked. So I'm sorry I can't be of help.
No, I did not find a solution. In the end, I just decided not to use the Matlab connection. I suspected it was because of my MATLAB version, someone else started it with a newer version an another PC and it worked. So I'm sorry I can't be of help.
Dila Türkmen
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Posted: 10 years ago Feb 11, 2015, 8:26 a.m. EST
Any solutions ? Same problem here.
Any solutions ? Same problem here.
Fangfei Sui
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Posted: 10 years ago Apr 20, 2015, 9:37 a.m. EDT
Did u solve the problem? Exactly the same problem here. It is the third time it happens. I reinstalled it twice before, but it was really not an efficient way.
Did u solve the problem? Exactly the same problem here. It is the third time it happens. I reinstalled it twice before, but it was really not an efficient way.
Oscar Diaz
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Posted: 9 years ago Aug 25, 2015, 4:05 p.m. EDT
Any chance that an expert answers this trend? I'm getting the same message on my Matlab CmdWin:
************
Error using mphstart (line 152)
A connection to Comsol could not be established. Please check that a Comsol Server is started prior to calling mphstart
************
even if the server has been previously started...
Any chance that an expert answers this trend? I'm getting the same message on my Matlab CmdWin: ************ Error using mphstart (line 152) A connection to Comsol could not be established. Please check that a Comsol Server is started prior to calling mphstart ************ even if the server has been previously started...
Lars Gregersen COMSOL Employee

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Posted: 9 years ago Sep 8, 2015, 3:24 a.m. EDT
Hi

There are a number of reasons why using mphstart may fail.

The most common problem is the use of a firewall that prevent the connections. You should also use a recent version of Matlab. The currently supported versions are listed here:
www.comsol.com/system-requirements/module
You can use older versions than the recommended, but some functionality may not work. Matlab versions older than R2010a are known NOT to work.

If you have problems with mphstart then send a mail to support. Please write what operating system you are using and what version of Matlab you have.

--
Lars Gregersen
Comsol Denmark
Hi There are a number of reasons why using mphstart may fail. The most common problem is the use of a firewall that prevent the connections. You should also use a recent version of Matlab. The currently supported versions are listed here: http://www.comsol.com/system-requirements/module You can use older versions than the recommended, but some functionality may not work. Matlab versions older than R2010a are known NOT to work. If you have problems with mphstart then send a mail to support. Please write what operating system you are using and what version of Matlab you have. -- Lars Gregersen Comsol Denmark
Zehui Yong
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Posted: 9 years ago Sep 19, 2015, 12:27 p.m. EDT
Hi I have met the same problem and finally found a solution..

If your condition is the same as me then it must be all fine when you call mphstart for the first time.

The problem happens when the first run is terminated and you want to call mphstart to connect again.

The reason of termination could be that you run ModelUtil.disconnect, or the comsolmphserver is for some reason terminated unexpectedly.

For both condition, before you call mphstart, you should call ModelUtil.clear and got a java exception. Then everything goes well.

I don't know why but it does work. It seems the first run has left something under the ModelUtil object which can inhibit your second connection.
Hi I have met the same problem and finally found a solution.. If your condition is the same as me then it must be all fine when you call mphstart for the first time. The problem happens when the first run is terminated and you want to call mphstart to connect again. The reason of termination could be that you run ModelUtil.disconnect, or the comsolmphserver is for some reason terminated unexpectedly. For both condition, before you call mphstart, you should call ModelUtil.clear and got a java exception. Then everything goes well. I don't know why but it does work. It seems the first run has left something under the ModelUtil object which can inhibit your second connection.
Camille Girabawe
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Posted: 9 years ago Nov 19, 2015, 10:47 a.m. EST



For both condition, before you call mphstart, you should call ModelUtil.clear and got a java exception. Then everything goes well.



ModelUtil.clear not working for me:
>> import com.comsol.model.*
>> import com.comsol.model.util.*
>> ModelUtil.clear
Undefined variable "ModelUtil" or function "ModelUtil.clear".
>>mphstart

or even
>> ModelUtil.clear
Undefined variable "ModelUtil" or function "ModelUtil.clear".
>>mphstart
>> import com.comsol.model.*
>> import com.comsol.model.util.*
[QUOTE] For both condition, before you call mphstart, you should call ModelUtil.clear and got a java exception. Then everything goes well. [/QUOTE] ModelUtil.clear not working for me: >> import com.comsol.model.* >> import com.comsol.model.util.* >> ModelUtil.clear Undefined variable "ModelUtil" or function "ModelUtil.clear". >>mphstart or even >> ModelUtil.clear Undefined variable "ModelUtil" or function "ModelUtil.clear". >>mphstart >> import com.comsol.model.* >> import com.comsol.model.util.*

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