DCE Backup Mount fails

[DCIM_Support]

After several months of success I can no longer mount a network share for DCE backups. The server does have GPO requiring NTLMv2 and 128 bit security. I am using 7.4.3.26 which gives me NTLMv2 as a protocol option.

I downloaded the logs as suggested in another thread. They show:

cifs_mount failed w/return code = -112

I have confirmed that the credentials specified are correct and that the user can access the share outside of DCE. In addition modifying the previously functional backup I have tried creating a new one.

Unable to find what return code -112 may be. Any assistance is appreciated.

Ed

(CID:125209683)

[DCIM_Support]

pretty sure this is related to SMB v1 being disabled in microsoft server OS' recently.  if this is the case, your only option is to find a server with smb v1 still enabled or use a NFS mount instead.   

hopefully a fix on the DCE end will be available in a future release.

(CID:125209702)

[DCIM_Support]

Good Call Andrew, 

Ed, if you can verify they're using SMB2, I do have an enhancement request in the system and will add this post to the request.

Thanks,

Steve 

(CID:125210005)

[DCIM_Support]

Awesome. Thanks. I'm going to proceed with attempting an NFS mount until an update is available.

Ed

(CID:125212618)

[DCIM_Support]

Hi Ed Krimmer,

See similar discussions on this topic , which have already been discussed repeatedly at DCIM Support.

With respect.

(CID:125209772)

[DCIM_Support]

Yes I had read the other threads but saw no reference to the error return code I dug out of the logs. Hence my "fresh" query. 

Ed

(CID:125210129)

[DCIM_Support]

Hi Ed Krimmer,

I downloaded the logs as suggested in another thread. They show:

cifs_mount failed w/return code = -112

I have confirmed that the credentials specified are correct and that the user can access the share outside of DCE. In addition modifying the previously functional backup I have tried creating a new one.

Unable to find what return code -112 may be. Any assistance is appreciated.

This is a question from the *nix world, which I will simply answer 😀. The DCE-server tries to mount your Windows resource using the mount command. According to Linux man page mount (8) this command has the following numbering of exit codes:

RETURN CODES
mount has the following return codes (the bits can be ORed):

0 success
1 incorrect invocation or permissions
2 system error (out of memory, cannot fork, no more loop devices)
4 internal mount bug
8 user interrupt
16 problems writing or locking /etc/mtab
32 mount failure
64 some mount succeeded

I.e., your mount return code -112 is a set of three errors:

112 = 64+32+16

Not very informative 😀, but to solve your problem with mounting NTLMv2 Windows resources, the DCE-server for the mount command should use the additional parameter -o sec=ntlmv2. But since the DCE-server is a closed black box, it remains only to wait for the developers to do this and publish a new DCE-release for customers.

Always glad to answer your questions.

(CID:125210147)

[DCIM_Support]

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