Thread: Connection issue

For some reason I can't connect to my PG 10.6.1 Server (running on Ubuntu) from my Windows installation (run via
Parallelson my Mac), no matter what app I use (tried psql, PGAdmin and my own app). 

When trying to connect from PGAdmin 4 the server logs say:

2019-02-05 10:34:30.558 CET [31051] [unbekannt]@[unbekannt] LOG:  00000: Verbindung empfangen:
Host=ip5b4054ce.dynamic.kabel-deutschland.dePort=50262 
2019-02-05 10:34:30.558 CET [31051] [unbekannt]@[unbekannt] ORT:  BackendInitialize, postmaster.c:4249
2019-02-05 10:34:30.648 CET [31051] [unbekannt]@[unbekannt] LOG:  08006: konnte Daten vom Client nicht empfangen:
Connectionreset by peer 
2019-02-05 10:34:30.648 CET [31051] [unbekannt]@[unbekannt] ORT:  pq_recvbuf, pqcomm.c:978

("konnte Daten vom Client nicht empfangen" means "couldn't receive data from client")
PGAdmin says the usual " Unable to connect to server:..."
No issue connecting from the Mac.
I see in the logfile that other windows users did connect successfully from their windows boxes so I am ready to
believethat maybe my Parallels somehow disconnects the connection quickly or something. 
Another strange thing is that if I try to connect from my Xojo app (which uses libpq internally) it says:SSL error:
unknownprotocol. I had no issue connecting last week from that installation so I am at my wits end... 

Tia,

Max

On 2/5/19 1:48 AM, Maximilian Tyrtania wrote:
> 
> For some reason I can't connect to my PG 10.6.1 Server (running on Ubuntu) from my Windows installation (run via
Parallelson my Mac), no matter what app I use (tried psql, PGAdmin and my own app).
 

Has it ever connected?

Have you recently updated any of the involved software?

More below.

> 
> When trying to connect from PGAdmin 4 the server logs say:
> 
> 2019-02-05 10:34:30.558 CET [31051] [unbekannt]@[unbekannt] LOG:  00000: Verbindung empfangen:
Host=ip5b4054ce.dynamic.kabel-deutschland.dePort=50262
 
> 2019-02-05 10:34:30.558 CET [31051] [unbekannt]@[unbekannt] ORT:  BackendInitialize, postmaster.c:4249
> 2019-02-05 10:34:30.648 CET [31051] [unbekannt]@[unbekannt] LOG:  08006: konnte Daten vom Client nicht empfangen:
Connectionreset by peer
 
> 2019-02-05 10:34:30.648 CET [31051] [unbekannt]@[unbekannt] ORT:  pq_recvbuf, pqcomm.c:978
> 
> ("konnte Daten vom Client nicht empfangen" means "couldn't receive data from client")
> PGAdmin says the usual " Unable to connect to server:..."
> No issue connecting from the Mac.
> I see in the logfile that other windows users did connect successfully from their windows boxes so I am ready to
believethat maybe my Parallels somehow disconnects the connection quickly or something.
 
> Another strange thing is that if I try to connect from my Xojo app (which uses libpq internally) it says:SSL error:
unknownprotocol. I had no issue connecting last week from that installation so I am at my wits end...
 

Where is the Xojo app running?

Is the pg_hba.conf on the server set up to allow connections from the 
client machines?

> 
> Tia,
> 
> Max
> 


-- 
Adrian Klaver
adrian.klaver@aklaver.com

Hi,

> On 5. Feb 2019, at 15:57, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
>
> On 2/5/19 1:48 AM, Maximilian Tyrtania wrote:
>> For some reason I can't connect to my PG 10.6.1 Server (running on Ubuntu) from my Windows installation (run via
Parallelson my Mac), no matter what app I use (tried psql, PGAdmin and my own app). 
>
> Has it ever connected?

Yes, it connected without issues last week.

> Have you recently updated any of the involved software?

Well, sure, but after I saw I couldn't connect I downloaded the current version of PGAdmin and psql and couldn't
connectwith them either. 

> More below.
>
>> When trying to connect from PGAdmin 4 the server logs say:
>> 2019-02-05 10:34:30.558 CET [31051] [unbekannt]@[unbekannt] LOG:  00000: Verbindung empfangen:
Host=ip5b4054ce.dynamic.kabel-deutschland.dePort=50262 
>> 2019-02-05 10:34:30.558 CET [31051] [unbekannt]@[unbekannt] ORT:  BackendInitialize, postmaster.c:4249
>> 2019-02-05 10:34:30.648 CET [31051] [unbekannt]@[unbekannt] LOG:  08006: konnte Daten vom Client nicht empfangen:
Connectionreset by peer 
>> 2019-02-05 10:34:30.648 CET [31051] [unbekannt]@[unbekannt] ORT:  pq_recvbuf, pqcomm.c:978
>> ("konnte Daten vom Client nicht empfangen" means "couldn't receive data from client")
>> PGAdmin says the usual " Unable to connect to server:..."
>> No issue connecting from the Mac.
>> I see in the logfile that other windows users did connect successfully from their windows boxes so I am ready to
believethat maybe my Parallels somehow disconnects the connection quickly or something. 
>> Another strange thing is that if I try to connect from my Xojo app (which uses libpq internally) it says:SSL error:
unknownprotocol. I had no issue connecting last week from that installation so I am at my wits end... 
>
> Where is the Xojo app running?
>
> Is the pg_hba.conf on the server set up to allow connections from the client machines?

Yes. Also the errormessage wouldn't be "Connection reset by peer" if it was a pga_hba.conf issue, would it? And anyway,
Ican connect just fine from my Mac with the same credentials. I wonder if this is maybe some Parallels issue. 

Thanks,
Max

On 2/5/19 7:18 AM, Maximilian Tyrtania wrote:
> Hi,
> 
>> On 5. Feb 2019, at 15:57, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
>>
>> On 2/5/19 1:48 AM, Maximilian Tyrtania wrote:
>>> For some reason I can't connect to my PG 10.6.1 Server (running on Ubuntu) from my Windows installation (run via
Parallelson my Mac), no matter what app I use (tried psql, PGAdmin and my own app).
 
>>
>> Has it ever connected?
> 
> Yes, it connected without issues last week.
> 
>> Have you recently updated any of the involved software?
> 
> Well, sure, but after I saw I couldn't connect I downloaded the current version of PGAdmin and psql and couldn't
connectwith them either.
 
> 
>> More below.
>>
>>> When trying to connect from PGAdmin 4 the server logs say:
>>> 2019-02-05 10:34:30.558 CET [31051] [unbekannt]@[unbekannt] LOG:  00000: Verbindung empfangen:
Host=ip5b4054ce.dynamic.kabel-deutschland.dePort=50262
 
>>> 2019-02-05 10:34:30.558 CET [31051] [unbekannt]@[unbekannt] ORT:  BackendInitialize, postmaster.c:4249
>>> 2019-02-05 10:34:30.648 CET [31051] [unbekannt]@[unbekannt] LOG:  08006: konnte Daten vom Client nicht empfangen:
Connectionreset by peer
 
>>> 2019-02-05 10:34:30.648 CET [31051] [unbekannt]@[unbekannt] ORT:  pq_recvbuf, pqcomm.c:978
>>> ("konnte Daten vom Client nicht empfangen" means "couldn't receive data from client")
>>> PGAdmin says the usual " Unable to connect to server:..."
>>> No issue connecting from the Mac.
>>> I see in the logfile that other windows users did connect successfully from their windows boxes so I am ready to
believethat maybe my Parallels somehow disconnects the connection quickly or something.
 
>>> Another strange thing is that if I try to connect from my Xojo app (which uses libpq internally) it says:SSL error:
unknownprotocol. I had no issue connecting last week from that installation so I am at my wits end...
 
>>
>> Where is the Xojo app running?
>>
>> Is the pg_hba.conf on the server set up to allow connections from the client machines?
> 
> Yes. Also the errormessage wouldn't be "Connection reset by peer" if it was a pga_hba.conf issue, would it? And
anyway,I can connect just fine from my Mac with the same credentials. I wonder if this is maybe some Parallels issue.
 

Well if you could connect from Parallels last week, you upgraded it and 
now you cannot connect then I would suspect it. This assumes that the 
Xojo app is also running in the Parallels instance. Given the SSL error 
you might see if they changed anything in that area.

> 
> Thanks,
> Max
> 


-- 
Adrian Klaver
adrian.klaver@aklaver.com

Well, the problem being a Parallels issue is just a wild theory of mine, it could well be something else. Honstly I
don'trecall updating anything in that area. As Mr. Gomez suggested I tried to  

ping - worked
telnet - did not work (infact I couldn't telnet anywhere)
tracert - worked

from my windows 10 box (didn't bother to check on my Mac as I have noc issues there). Still curious as to why the
serverwould say "Connection reset by peer". 

Thanks, Max

On 2/6/19 7:18 AM, Maximilian Tyrtania wrote:
> Well, the problem being a Parallels issue is just a wild theory of mine, it could well be something else. Honstly I
don'trecall updating anything in that area. As Mr. Gomez suggested I tried to
 

So from a previous post:

 > Have you recently updated any of the involved software?

Well, sure, but after I saw I couldn't connect ...

So what happened in the interval between the time you could connect and 
the time you could not?

> 
> ping - worked
> telnet - did not work (infact I couldn't telnet anywhere)

In my experience telnet is generally disabled these days.

> tracert - worked
> 
> from my windows 10 box (didn't bother to check on my Mac as I have noc issues there). Still curious as to why the
serverwould say "Connection reset by peer".
 

Well if you are running Windows --> Parallels --> OS X(Mac) --> Serve, 
you are effectively testing the Mac also.

As to 'Connection reset by peer':

A grep of the Postgres source find this:

interfaces/libpq/win32.c

* Contains table and functions for looking up win32 socket error
* descriptions. But will/may contain other win32 helper functions
* for libpq.


WSAECONNRESET, "Connection reset by peer"

Looking up WSAECONNRESET finds this:

https://docs.microsoft.com/en-us/windows/desktop/WinSock/windows-sockets-error-codes-2


WSAECONNRESET
10054

Connection reset by peer.
     An existing connection was forcibly closed by the remote host. This 
normally results if the peer application on the remote host is suddenly 
stopped, the host is rebooted, the host or remote network interface is 
disabled, or the remote host uses a hard close (see setsockopt for more 
information on the SO_LINGER option on the remote socket). This error 
may also result if a connection was broken due to keep-alive activity 
detecting a failure while one or more operations are in progress. 
Operations that were in progress fail with WSAENETRESET. Subsequent 
operations fail with WSAECONNRESET.

> 
> Thanks, Max
> 


-- 
Adrian Klaver
adrian.klaver@aklaver.com

Hi again,


> On 6. Feb 2019, at 17:19, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
>
> On 2/6/19 7:18 AM, Maximilian Tyrtania wrote:
>> Well, the problem being a Parallels issue is just a wild theory of mine, it could well be something else. Honstly I
don'trecall updating anything in that area. As Mr. Gomez suggested I tried to 
>
> So from a previous post:
>
> > Have you recently updated any of the involved software?
>
> Well, sure, but after I saw I couldn't connect ...
>
> So what happened in the interval between the time you could connect and the time you could not?

I did update parts of my app (including the plugin which in turn encapsulates libpq). I did not update my parallels
installation,as far as I remember. Sorry if I was unclear about that. 

>> ping - worked
>> telnet - did not work (infact I couldn't telnet anywhere)
>
> In my experience telnet is generally disabled these days.

I had to enable it on my Windows box, if that's what you mean. The "telnet" command works by itself, but I didnt
receiveanything when trying to telnet to some other machine. 

>> tracert - worked
>> from my windows 10 box (didn't bother to check on my Mac as I have noc issues there). Still curious as to why the
serverwould say "Connection reset by peer". 
>
> Well if you are running Windows --> Parallels --> OS X(Mac) --> Serve, you are effectively testing the Mac also.
>
> As to 'Connection reset by peer':
>
> A grep of the Postgres source find this:
>
> interfaces/libpq/win32.c
>
> * Contains table and functions for looking up win32 socket error
> * descriptions. But will/may contain other win32 helper functions
> * for libpq.
>
>
> WSAECONNRESET, "Connection reset by peer"
>
> Looking up WSAECONNRESET finds this:
>
> https://docs.microsoft.com/en-us/windows/desktop/WinSock/windows-sockets-error-codes-2
>
>
> WSAECONNRESET
> 10054
>
> Connection reset by peer.
>    An existing connection was forcibly closed by the remote host. This normally results if the peer application on
theremote host is suddenly stopped, the host is rebooted, the host or remote network interface is disabled, or the
remotehost uses a hard close (see setsockopt for more information on the SO_LINGER option on the remote socket). This
errormay also result if a connection was broken due to keep-alive activity detecting a failure while one or more
operationsare in progress. Operations that were in progress fail with WSAENETRESET. Subsequent operations fail with
WSAECONNRESET.

Ah, thanks for digging that up. Hmm, sounds as if something is definetly wrong on my windows box.

I'll try contacting the Parallels support guys.

Thanks again,

Max

On 2/6/19 8:30 AM, Maximilian Tyrtania wrote:
> Hi again,
> 
> 
>> On 6. Feb 2019, at 17:19, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
>>
>> On 2/6/19 7:18 AM, Maximilian Tyrtania wrote:
>>> Well, the problem being a Parallels issue is just a wild theory of mine, it could well be something else. Honstly I
don'trecall updating anything in that area. As Mr. Gomez suggested I tried to
 
>>
>> So from a previous post:
>>
>>> Have you recently updated any of the involved software?
>>
>> Well, sure, but after I saw I couldn't connect ...
>>
>> So what happened in the interval between the time you could connect and the time you could not?
> 
> I did update parts of my app (including the plugin which in turn encapsulates libpq). I did not update my parallels
installation,as far as I remember. Sorry if I was unclear about that.
 

What is the plugin?

Can you roll back the plugin upgrade to see if that is the problem?


> 
>>> ping - worked
>>> telnet - did not work (infact I couldn't telnet anywhere)
>>
>> In my experience telnet is generally disabled these days.
> 
> I had to enable it on my Windows box, if that's what you mean. The "telnet" command works by itself, but I didnt
receiveanything when trying to telnet to some other machine.
 
> 

Probably because Telnet is not enabled on the server as it is not a 
secure protocol:
https://en.wikipedia.org/wiki/Telnet

> 
> Ah, thanks for digging that up. Hmm, sounds as if something is definetly wrong on my windows box.
> 
> I'll try contacting the Parallels support guys.
> 
> Thanks again,
> 
> Max
> 


-- 
Adrian Klaver
adrian.klaver@aklaver.com

Just for the record, updating to Mac OS 10.14.3 resolved the issue.
Thanks, Max